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Sökning: onr:"swepub:oai:DiVA.org:uu-346887" > The GALAH survey :

The GALAH survey : chemical tagging of star clusters and new members in the Pleiades

Kos, Janez (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.
Bland-Hawthor, Joss (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia.
Freeman, Ken (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
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Buder, Sven (författare)
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
Traven, Gregor (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.
De Silva, Gayandhi M. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.;Australian Astron Observ, N Ryde, NSW 2133, Australia.
Sharma, Sanjib (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.
Asplund, Martin (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Duong, Ly (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Lin, Jane (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Lind, Karin (författare)
Uppsala universitet,Institutionen för fysik och astronomi,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
Martell, Sarah (författare)
UNSW, Sch Phys, Sydney, NSW 2052, Australia.
Simpson, Jeffrey D. (författare)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia.
Stello, Dennis (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.;UNSW, Sch Phys, Sydney, NSW 2052, Australia.;Aarhus Univ, Stellar Astrophys Ctr, Dept Phys & Astron, DK-8000 Aarhus C, Denmark.
Zucker, Daniel B. (författare)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia.
Zwitter, Tomaz (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia.
Anguiano, Borja (författare)
Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA.
Da Costa, Gary (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
D'Orazi, Valentina (författare)
Osserv Astron Padova, INAF, Vicolo Osservatorio 5, I-35122 Padua, Italy.
Horner, Jonathan (författare)
Univ Southern Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld 4350, Australia.
Kafle, Prajwal R. (författare)
Univ Western Australia M468, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia.
Lewis, Geraint (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.
Munari, Ulisse (författare)
Astron Observ Padova, INAF Natl Inst Astrophys, I-36012 Asiago, Italy.
Nataf, David M. (författare)
Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA.;Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
Ness, Melissa (författare)
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany.
Reid, Warren (författare)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia.;Western Sydney Univ, Locked Bag 1797, Penrith, NSW 2751, Australia.
Schlesinger, Katie (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Ting, Yuan-Sen (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia.
Wyse, Rosemary (författare)
Johns Hopkins Univ, Ctr Astrophys Sci, Baltimore, MD 21218 USA.;Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA.
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Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia Univ Sydney, Sch Phys, Sydney Inst Astron, A28, Sydney, NSW 2006, Australia.;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Canberra, ACT, Australia. (creator_code:org_t)
2017-10-17
2018
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press. - 0035-8711 .- 1365-2966. ; 473:4, s. 4612-4633
Relaterad länk:
http://eprints.usq.e...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • The technique of chemical tagging uses the elemental abundances of stellar atmospheres to 'reconstruct' chemically homogeneous star clusters that have long since dispersed. The GALAH spectroscopic survey - which aims to observe one million stars using the Anglo-Australian Telescope - allows us to measure up to 30 elements or dimensions in the stellar chemical abundance space, many of which are not independent. How to find clustering reliably in a noisy high-dimensional space is a difficult problem that remains largely unsolved. Here, we explore t-distributed stochastic neighbour embedding (t-SNE) - which identifies an optimal mapping of a high-dimensional space into fewer dimensions - whilst conserving the original clustering information. Typically, the projection is made to a 2D space to aid recognition of clusters by eye. We show that this method is a reliable tool for chemical tagging because it can: (i) resolve clustering in chemical space alone, (ii) recover known open and globular clusters with high efficiency and low contamination, and (iii) relate field stars to known clusters. t-SNE also provides a useful visualization of a high-dimensional space. We demonstrate the method on a data set of 13 abundances measured in the spectra of 187 000 stars by the GALAH survey. We recover seven of the nine observed clusters (six globular and three open clusters) in chemical space with minimal contamination from field stars and low numbers of outliers. With chemical tagging, we also identify two Pleiades supercluster members (which we confirm kinematically), one as far as 6 degrees-one tidal radius away from the cluster centre.

Ämnesord

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Nyckelord

methods: data analysis
stars: abundances
open clusters and associations: general
open clusters and associations: individual: Pleiades

Publikations- och innehållstyp

ref (ämneskategori)
art (ämneskategori)

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