Researchers conduct chemical study of an old metalrich globular cluster

first_img More information: Chemical Study of the Metal-rich Globular Cluster NGC 5927, arXiv:1711.03176 [astro-ph.SR] arxiv.org/abs/1711.03176AbstractGlobular Clusters (GCs) are natural laboratories where stellar and chemical evolution can be studied in detail. In addition, their chemical patterns and kinematics can tell us wich Galactic structure (Disk, Bulge, Halo or extragalactic) the cluster belongs to. NGC 5927 is one of most metal-rich GCs in the Galaxy and its kinematics links it to the Thick Disk. We present abundance analysis based on high resolution spectra of 7 giant stars. The data were obtained using FLAMES/UVES spectrograph mounted on UT2 telescope of the European Southern Observatory. The principal motivation of this work is to perform a wide and detailed chemical abundance analysis of the cluster and look for possible Multiple Populations (MPs). We determined stellar parameters and measured 22 elements corresponding to light (Na, Al), alpha (O, Mg, Si, Ca, Ti), iron-peak (Sc, V, Cr, Mn, Fe, Co, Ni, Cu, Zn) and heavy elements (Y, Zr, Ba, Ce, Nd, Eu). We found a mean iron content of [Fe/H]=-0.47 ±0.02 (error on the mean). We confirm the existence of MPs in this GC with an O-Na anti-correlation, and moderate spread in Al abundances. We estimate a mean [α/Fe]=0.25 ±0.08. Iron-peak elements shows no significant spread. The [Ba/Eu] ratios indicate a predominant contribution from SNeII for the formation of the cluster. Researchers investigate chemical composition of globular cluster NGC 6362 © 2017 Phys.org (Phys.org)—Chilean researchers have presented a chemical study of the old, metal-rich globular cluster NGC 5927. The new research determines abundances of 22 elements in seven giant stars of the cluster. The findings are available in a paper published November 8 on the arXiv pre-print repository. Discovered in 1826, NGC 5927 is a globular cluster near the Galactic plane, located about 7,700 light years from the Earth. It is one of most metal-rich globular clusters in the Milky Way and has an estimated age of approximately 12.25 billion years.Galactic globular clusters, especially such old as NGC 5927, are important for astronomers since they are among the oldest objects in the universe. Therefore, they could serve as natural laboratories for the study of stellar evolution processes.In the case of NGC 5927, it is believed that it was formed during the earliest stages of the formation of the Milky Way. Hence, researchers hope that this cluster could provide essential information about how the initial material got processed chemically.A team of astronomers led by Aldo Mura-Guzman of the University of Concepción in Chile, has lately performed a chemical study of NGC 5927. They obtained high-resolution spectra using the FLAMES/UVES spectrograph at the UT2 telescope of the European Southern Observatory (ESO) in Chile, which allowed them to conduct a detailed chemical abundances analysis of this cluster.”In this paper we present a chemical study of the GC NGC 5927 based on high-resolution spectra taken from UVES,” the authors wrote in the paper.The researchers determined chemical abundances 22 such as sodium, aluminum, iron, oxygen and heavy elements like yttrium and zirconium. They found that NGC 5927 hosts multiple stellar populations with oxygen-sodium anti-correlation, and moderate spread in aluminum abundances.According to the paper, NGC 5927 has a mean metallicity of –0.47 dex, what is consistent with previous studies. This value is comparable with field stars and globular clusters in the Milky Way’s bulge. Moreover, the scientists noted that no significant spread in other iron-peak elements is visible in the studied cluster.Furthermore, the researchers confirmed a sodium-aluminum correlation but found no clear evidence for magnesium-aluminum anti-correlation in NGC 5927. The study also revealed that heavy s-process elements show no significant spread in this cluster. According to the authors of the paper, this seems to contradict the theory that asymptotic giant branch stars are polluters for the second generation stars.In concluding remarks, the researchers noted that NGC 5927 is similar the globular cluster NGC 6440 in the Milky Way’s bulge when it comes to chemical composition. This suggests similar origins between these two clusters.”The chemical similarities of NGC 5927 with Bulge GCs and especially with NGC 6440, lead us to consider a formation scenario where NGC 5927 was formed from material in-between the Bulge and Disk, when both structures were still in formation,” the scientists concluded. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. A 10′ × 10′ digitized sky survey image centered on NGC 5927. North is up and east to the left. The green symbols show the location of the spatial distribution of the 7 stars analyzed. Credit: Mura-Guzman et al., 2017. Citation: Researchers conduct chemical study of an old, metal-rich globular cluster (2017, November 21) retrieved 18 August 2019 from https://phys.org/news/2017-11-chemical-metal-rich-globular-cluster.html Explore furtherlast_img read more

Have smartphones really destroyed a generation We dont know

first_img“Have Smartphones Destroyed a Generation?” the Atlantic asked in a provocative and widely read 2017 cover story. That article, by San Diego State University psychology professor Jean Twenge, summarized the correlational data linking teen mental health with technology and suggested the answer was yes. There’s also a sense, in the conventional wisdom, that the answer must be yes. Teens in the United States are coming of age at a time when digital technology is truly ubiquitous, where smartphones are our “constant companions.” These youth are also, according to national surveys, increasingly in crisis. Here are some of the most troubling statistics. Between 2009 and 2017, the number of high schoolers who contemplated suicide increased 25 percent. The number of teens diagnosed with clinical depression grew 37 percent between 2005 and 2014. It could be that more teens are willing to admit they’re struggling and are seeking help. But deaths by suicide among teens have increased as well. A recent study found that poisoning attempts by girls ages 10 to 12 increased 268 percent from 2010 to 2017. center_img As adults have noticed these trends, they’ve begun to worry: It’s the phones. Public fears about smartphones aren’t limited to mood disorders like depression, or rates of anxiety. There’s panic about gaming or tech “addiction,” and that we’re losing our ability to focus or remember due to the ubiquity of digital tech. These concerns are easily lumped together into one overarching fear: Tech is messing with our minds. Read the whole story: Voxlast_img read more

Hand shakes

first_imgNoted danseuse, Shallu Jindal’s an hour long performance at Kamani Auditorium on 1 November took the Capital to a scintillating journey into the world of Kuchipudi. Her daughter, Yashasvini, an upcoming Kuchipudi dancer, was also part of the performance.The classical repertoire portrayed different elements of Krishna-leela through Kuchipudi. The performance started with an invocation of Lord Venkateswara. This was followed by a rendition on Mere Saason ki Maala (a Meera Bai bhajan popularised by Nusrat Fateh Ali Khan) fused with sufi and Hindustani music.  It was followed by Thillana – a traditional Kuchipudi Nritya item.  Also Read – ‘Playing Jojo was emotionally exhausting’The third part of the performance was Madhushala –  a unique performance on the poem by the famed Late Harivansh Rai Bachchan.The evening ended with Tarangam in which Jindal performed on the edges of a brass plate in devotion to Lord Krishna. This item displayed an exquisite virtuosity as the dancer executes intricate footwork patterns by dancing on the rim of a brass plate and coordinates them with complicated rhythmic patterns. It is said to be the union of the Atma (soul) with the Parmatma (Almighty).last_img read more

HIDCO to increase green cover of New Town

first_imgKolkata: Housing Infrastructure Development Corporation (HIDCO) will set up more urban forests in New Town to increase its green cover.A meeting was held between senior officials of HIDCO and their counterparts in the state Forest department, to make plans to plant saplings during monsoon. HIDCO had planted 65,000 saplings in 2017. A survey was conducted to find out how many saplings have died and following that, new saplings were planted in those areas. In 2018, thousands of saplings will be planted on Forest week. Also Read – Heavy rain hits traffic, flightsThe Wasteland Forest Development Corporation has set up a tall tree nursery and tall tree saplings are being sold from there at affordable prices. There is enthusiasm among the residents of different housing complexes to plant tall trees and look after them.Big trees are being grown on 3 acres of land in Eco Park. Another urban forest comprising only Neem trees will come up on 5 acres of land. HIDCO has decided to plant trees in small parks and similar land, to increase the green cover of New Town. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedTo water the roadside trees, waste water is being recycled and specially designed vehicles are being deployed to water the plants. There are parks in every block and they are being maintained carefully. Swapno Bhor, a retreat meant for senior citizens, has a lush green park covering an area of 3 acres. Trees are also being planted throughout New Town.Eco Park, the biggest urban park in Bengal, which stands on 480 acres of land covered by 112 acres of waterbody, has trees all around. There are flower gardens and gardens for medicinal plants.It may be mentioned that after coming to power in 2011, Chief Minister Mamata Banerjee had taken the initiative to make New Town a green city. The erstwhile Left Front government, which had constructed New Town, did not make any plan to increase its green cover and the entire area used to look like a barren desert.last_img read more

Bengal set to boost raw silk production following success of bivoltine farming

first_imgKolkata: With the state witnessing a nine-fold increase in the production of bivoltine silk in the past seven years, the state government is targeting to extend the cultivation of raw silk on a new area of 1,620 acres in the 2018-19 fiscal.In the 2017-18 financial year, the area of plantation for the same was increased by 1,733 acres and it resulted in an yield of 2,540 metric tonne (MT) mulberry, 34.50 MT tasar, 2.60 MT eri and 185 kg muga raw silk. Also Read – Heavy rain hits traffic, flightsAsish Banerjee, the state Agriculture minister, held a high level meeting with senior officials of the directorate of sericulture, that falls under his department. Pradip Mazumdar, advisor to the Chief Minister on agriculture, was also present in the meeting in which there was discussion on various issues of sericulture.The Agriculture minister said the production targets for raw silk in 2018-19 are 2,575 MT mulberry, 46 MT tasar, 6 MT eri and 400 kg muga. “We are taking all necessary steps to ensure the same,” he said, adding that infrastructure including 898 rearing houses, 147 vermi-compost sheds and 10 cocoon storage buildings were developed to extend support to silk farmers in 2017-18. Also Read – Speeding Jaguar crashes into Merc, 2 B’deshi bystanders killedGiving a breakup of the 1,620 acres of land that will be brought under sericulture in 2018-19, Banerjee said 1,000 acres will be for mulberry, 400 acres for tasar, 70 acres for muga and 150 acres for eri.Large areas of land in districts including West Midnapore, Jhargram, Purulia, Bankura and Birbhum in Jungalmahal have been brought under tasar cultivation in 2017-18, where 18,040 people were benefitted.It may be mentioned that the bivoltine silk production in 2012-13 was 7.16 MT and it has gone up to 36 MT in 2017-18. An issue related to the problems that silk farmers are facing also came up in the meeting and it includes the problems that silk farmers are facing in Murshidabad and some parts of Nadia, where pesticides spread on vegetables are adversely affecting the silk cultivation within 1.5 kilometres. The state Agriculture department will be organising a symposium, in which officials of agriculture, horticulture and sericulture sections will be present. Representative of silk-farmers will also be attending the symposium.last_img read more

Space bound

first_imgCan art activate a building and stimulate a multi-sensory experience between the artwork and the structural form it occupies? At Khoj Studios, nine artistes have achieved in doing just that through an exhibition of on-site, multi-media works that explore light, colour, shape, size and unusual material within the white shell of the Khoj building.Titled Activating Space: A Sculptural Enquiry, the exhibition, including drawings, video, mixed media installation, mirrors, metal, and even shadows, commenced on April 23 and will be on till May 15. Activating Space is also a unique new program that departs from the specific, thematic orientation of most of the other residencies and exhibitions organised by Khoj. It invites sculptors, architects, visual artists and other creative practitioners to engage with the loose and accommodative rubric of site-specificity.  Also Read – ‘Playing Jojo was emotionally exhausting’The participating artistes are Gagan Singh, Lleah Smith and James Gatt, Pooja Iranna, Priyamwada Singh, Samrudh Dixit, Sanket Jadia, Shaily Gupta and Henri Fanthome, Sikan Kumar Panda, and Teja Gavankar.“The project invites the most unusual, unique and bizarre materials into Khoj to permeate the exterior space and explore realms which otherwise can go by un-noticed. No interior studio or project space will be used in the installation of the exhibition,” says Promona Sengupta, Program Manager, Khoj.   Also Read – Leslie doing new comedy special with NetflixSeven individual artistes and two art collectives use its pre-existing architecture/facade to sculpturally investigate the form and the site, to ignite a sense of discovery and wonder and to find an interesting dialogue between the two forms. Elements of exploration, disguise, and emphasis are all equally at play as artists are encouraged to explore the divisions of subtly and strength and harmony and contrast in the work and the building.Gagan Singh has made miniature size paper cut outs, mostly depicting himself in various situations, and placed these all over the Khoj staircase, railings and even walls. Lleah Smith and James Gatt are part of the art collective Dandelion which is an artist collective based in Sydney, Australia. Their work Oasis includes a staircase laden with paper flowers and plastic bags filled with coloured water scattered on the rooftop. Pooja Iranna has been working on the subject of architectural spaces for decades and is known not only for her watercolours, staple pin sculptures, photographical work but also videos. Her work is titled as Swaas. Priyamwada Singh’s work is a chime-like installation work at Khoj is titled Time Traces — A Sensory Experiential placed right at the entrance. Samrudh Dixit has worked nationally on trans-disciplinary innovation projects that have spanned product and space design through/to music, structural design and services. Her rooftop installation is titled Cede which is a canvas based canopy with nylon strings.Sanket Jadia’s work Identical Universe, Inverse Reality is a 16 by 16 feel wall made of 10 mirrors that reflects the entire Khoj building is an attempt to engage with the dynamics of the existing space and architecture. Architects Shaily Gupta and Henri Fanthome are working at Khoj together.They say, “The building of Khoj, in its present shape and form, and with its numerous stairs and landings, creates a spatial framework. Within the white walls, the stairs, the landings and with the tree – mixing the real with the imagined, the permanent, with the transient, the accessible with the inaccessible is the aim.”Sikan Kumar Panda is a Delhi-based visual artist and a graduate in printmaking from University of Hyderabad. He says about his thread sculptural work Invisible Ways. Teja Gavankar’s project is called Over Consuming which is a state of being occupied with many things.When: On till May 15Where: Khoj Studioslast_img read more

Auto driver held for trying to molest female passenger

first_imgKolkata: An auto rickshaw driver was arrested by New Town police station for allegedly trying to sexually harass a woman. Some locals heard the woman’s scream and rushed to her aid. They succeeded in detaining the auto driver and later informed the police.According to the victim, she works as a maid in Salt Lake and originally hails from Alwar in Rajasthan. In Kolkata, she used stay in Keshtopur Mission Bazar area. On Tuesday night at around 9 pm, she boarded an auto from outside Bidhannagar Road station area, to go towards Keshtopur. But the driver Suvojit Nath drove his auto towards Salt Lake. Also Read – Rain batters Kolkata, cripples normal lifeWhen she realised that she was being taken on a wrong route, she asked Nath to stop the auto. But Nath assured her that he would take her to her destination. When the auto reached near 206 bus stand, she again asked Nath to stop the auto at the bus stand. In reply, Nath told her that he would take her to Keshtopur VIP through Sector V. But Nath drove along the Biswa Bangla Sarani. Though she tried to scream, Nath threatened her with dire consequences. He then forced her to get off from the auto after reaching an isolated place near Ecospace in New Town. Also Read – Speeding Jaguar crashes into Mercedes car in Kolkata, 2 pedestrians killedThough the woman tried to run, Nath obstructed her from behind and tried to outrage her modesty. The woman tried to free herself from him but was not able do so and started crying for help. Sensing danger, he tried to stop her from alerting others in the area, by choking her throat. Meanwhile, some locals heard her scream and went towards the isolated place. They found that Nath was trying to sexually harass a woman. Seeing resistance, Nath tried to flee but two of the locals were able to detain him. Police was informed immediately. Later, police went to the spot and detained Nath and his auto. On Wednesday morning, she lodged a complaint against the auto driver with the Bidhannagar Women police station, following which Nath was arrested.last_img read more

Glitz and Glamour

first_imgKeeping up with the fad of ever changing fashion is not something many can do, and hosting a fashion weekend just adds onto the task. The Ambience Group has crafted some of the most exciting, enduring and profitable shopping and leisure destinations in the NCR. Lifestyle, leisure, shopping and entertainment make them the perfect destination for any urban Indian, housing International brands like Marks & Spencer, H&M, The collective, Thomas Pink, Gap and many more. Also Read – Add new books to your shelfBeing a pioneer in an ever-evolving retail industry, Arjun Singh Gehlot and Shahista Gehlot have outdone themselves by introducing and launching yet another property titled ‘The Ambience Fashion Weekend- 2016’- conceptualized and hosted by them. A two-day extravaganza took fashion and retail to the next level. The first day, November 4 witnessed, as promised a  glamorous opening with the crème da la crème of fashion and retail in attendance at the fashion weekend.  Also Read – Over 2 hours screen time daily will make your kids impulsive‘The Ambience Fashion Weekend’, began with a bang! The Fashion show opened with brands like Marks & Spencer, Scullers, United Colors of Benetton, Creyate, Fab India, Gems, Satya Paul, Trends and was choreographed and presented by fashion guru – Prasad Bidapa. Latest trends of high-fashion were displayed by international retail giants and popular Indian brands.Adding glitz and glamour to this night dedicated to Fashion- Barfi and Mein tera Hero famed Bollywood actor Ileana D’Cruz walked the ramp as the showstopper and looked stunning in a Marks & Spencer outfit. The exclusive fashion presentation saw the who’s who of the fashion circuit of Delhi, fashion and lifestyle bloggers, celebrities, designers and imminent personalities from the retail industry.last_img read more

Amp up safety standards for stuntmen says Madhavan

first_imgActor R. Madhavan has shown concern towards the two actors who drowned while filming a climax scene for a Kannada film. The actor has requested to “amp up” the safety standards for the stuntmen. He tweeted on Tuesday evening, a day after two actors drowned in a water reservoir after leaping off a helicopter while shooting a crucial climax scene for a Kannada film near Bengaluru. Madhavan says the news is “really saddening”. “Really really saddening…my condolences with an earnest request to amp up the safety standard for stuntmen effectively and judiciously,” Madhavan tweeted.  Madhavan had re-tweeted the video and a tweet by southern actor Suriya Sivakumar, who asserted that it is high time the safety of the crew is taken seriously.  Also Read – Add new books to your shelf“Deeply saddened! At the age of VFX this is unfortunate! High time, safety of the crew is taken seriously! My condolences to family members,” Sivakumar tweeted. The incident involved famous southern actor Duniya Vijay, who swam to safety and even had a life jacket, and two others — identified as Anil and Uday — who drowned after jumping off the helicopter. They had no safety harness and did not know how to swim either.last_img read more

Malda student tops in state city shines in CBSE 2019 results

first_imgKolkata: Sumaita Laisa of Usha Martin School in Shimuldhabi under Gajole police station area in Malda has topped from the state in the CBSE Class X examination, the results of which were declared on Monday. Laisa scored 99.4 percent marks, bagging 497 out of 500.Chief Minister Mamata Banerjee congratulated the students of the state. “Congratulations to all students who excelled and those who passed the CBSE exams. Good wishes to your parents and good luck for all your future endeavours,” she tweeted. Also Read – Rs 13,000 crore investment to provide 2 lakh jobs: Mamata”I had expected 95 to 96 percent marks but 99.4 percent came as a surprise for me. I want to be a doctor so I will take up Biology in my higher studies,” Laisa said. The schools in Kolkata affiliated to the CBSE board also fared well, with South Point High School emerging at the top with Suchana Haldar scoring 496 out of 500. However, Saumodip Das of Khalsa Model High School in Dunlop scored the same marks as Suchana. “I want to study Chemistry in my higher education. The support from my parents and my school has contributed to my success. I was confident of scoring high marks but 99.2 percent has come as a surprise,” Saumodip said. Also Read – Lightning kills 8, injures 16 in stateHis father Amarnath Das, who works in an MNC, said that he studied six to seven hours daily and would never keep any school assignment pending. “He has been topping the school right from nursery,” Das added. Suchana wants to become a doctor like his father. “The credit goes to my parents who devoted calculative time despite their busy schedule. I had a single private tutor,” she said. Her father D K Halder, who is an ENT specialist at Panihati State General Hospital, said: “I have twins studying in South Point. My son Saswata also got 95 percent marks. He has also taken Bio-Science in higher secondary level like my daughter. They both are very good in table tennis and have represented their school team in other states and have bagged prizes.” A total of 725 students appeared from South Point High School, out of which 223 scored 95 percent and above. Rounak Roy and Sreyashi Holme Choudhury have both scored 495 out of 500. Abhirup Mistry of Birla Bharati School at Santoshpur located in the southern fringes of the city scored 495 out of 500. Interestingly, Abhirup did not have a single private tutor. “Our teachers have been so cooperative. I cleared doubts if any from them only,” Abhirup said. DPS Ruby Park also performed very well with four of the students bagging more than 98 percent marks. Lokesh Somani of Birla High School emerged as the topper in the school with 98.4 percent, in which 53 got more than 90 percent marks out of 163 students.last_img read more