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Sökning: WFRF:(De Silva Gayandhi M.) > The K2-HERMES Survey :

The K2-HERMES Survey : age and metallicity of the thick disc

Sharma, Sanjib (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia
Stello, Dennis (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
Bland-Hawthorn, Joss (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia
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Hayden, Michael R. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia
Zinn, Joel C. (författare)
Ohio State Univ, Dept Astron, Columbus, OH 43210 USA
Kallinger, Thomas (författare)
Univ Vienna, Inst Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria
Hon, Marc (författare)
Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
Asplund, Martin (författare)
ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
Buder, Sven (författare)
Heidelberg Univ, Int Max Planck Res, Sch Astron & Cosm Phys, Heidelberg, Germany;MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany
De Silva, Gayandhi M. (författare)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia
D'Orazi, Valentina (författare)
INAF, Vicolo Osservatorio 5, I-35122 Padua, PD, Italy
Freeman, Ken (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
Kos, Janez (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Lewis, Geraint F. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Lin, Jane (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
Lind, Karin (författare)
Uppsala universitet,Observationell astrofysik,MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany
Martell, Sarah (författare)
ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
Simpson, Jeffrey D. (författare)
Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
Wittenmyer, Rob A. (författare)
Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia
Zucker, Daniel B. (författare)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia;Macquarie Univ, Res Ctr Astron Astrophys & Astrophoton, Sydney, NSW 2109, Australia
Zwitter, Tomaz (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Bedding, Timothy R. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Chen, Boquan (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Cotar, Klemen (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Esdaile, James (författare)
Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
Horner, Jonathan (författare)
Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia
Huber, Daniel (författare)
Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, Ny Munkegade 120, DK-8000 Aarhus C, Denmark;Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA;SETI Inst, 189 Bernardo Ave, Mountain View, CA 94043 USA
Kafle, Prajwal R. (författare)
Univ Western Australia, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia
Khanna, Shourya (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Li, Tanda (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Ting, Yuan-Sen (författare)
Inst Adv Study, Princeton, NJ 08540 USA;Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA;Observ Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA
Nataf, David M. (författare)
Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
Nordlander, Thomas (författare)
ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia
Saadon, Mohd Hafiz Mohd (författare)
Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
Traven, Gregor (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Wright, Duncan (författare)
Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia
Wyse, Rosemary F. G. (författare)
Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
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 (creator_code:org_t)
2019-10-12
2019
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 490:4, s. 5335-5352
Relaterad länk:
https://academic.oup...
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https://urn.kb.se/re...
https://doi.org/10.1...
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  • Tidskriftsartikel (refereegranskat)
Abstract Ämnesord
Stäng  
  • Asteroseismology is a promising tool to study Galactic structure and evolution because it can probe the ages of stars. Earlier attempts comparing seismic data from the Kepler satellite with predictions from Galaxy models found that the models predicted more low-mass stars compared to the observed distribution of masses. It was unclear if the mismatch was due to inaccuracies in the Galactic models, or the unknown aspects of the selection function of the stars. Using new data from the K2 mission, which has a well-defined selection function, we find that an oldmetal-poor thick disc, as used in previous Galactic models, is incompatible with the asteroseismic information. We use an importance-sampling framework, which takes the selection function into account, to fit for the metallicities of a population synthesis model using spectroscopic data. We show that spectroscopic measurements of [Fe/H] and [alpha/Fe] elemental abundances from the GALAH survey indicate a mean metallicity of log (Z/Z(circle dot)) = -0.16 for the thick disc. Here Z is the effective solar-scaled metallicity, which is a function of [Fe/H] and [alpha/Fe]. With the revised disc metallicities, for the first time, the theoretically predicted distribution of seismic masses show excellent agreement with the observed distribution of masses. This indirectly verifies that the asteroseismic mass scaling relation is good to within five per cent. Assuming the asteroseismic scaling relations are correct, we estimate the mean age of the thick disc to be about 10 Gyr, in agreement with the traditional idea of an old alpha-enhanced thick disc.

Ämnesord

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

Nyckelord

methods: data analysis
methods: numerical
Galaxy: stellar content
Galaxy: structure

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art (ämneskategori)

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