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  • Sharma, SanjibUniv Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia (författare)

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

  • Artikel/kapitelEngelska2019

Förlag, utgivningsår, omfång ...

  • 2019-10-12
  • OXFORD UNIV PRESS,2019
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:uu-402662
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-402662URI
  • https://doi.org/10.1093/mnras/stz2861DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • 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 och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Stello, DennisUniv 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 (författare)
  • Bland-Hawthorn, JossUniv Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia (författare)
  • Hayden, Michael R.Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia (författare)
  • Zinn, Joel C.Ohio State Univ, Dept Astron, Columbus, OH 43210 USA (författare)
  • Kallinger, ThomasUniv Vienna, Inst Astrophys, Turkenschanzstr 17, A-1180 Vienna, Austria (författare)
  • Hon, MarcUniv New South Wales, Sch Phys, Sydney, NSW 2052, Australia (författare)
  • Asplund, MartinARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (författare)
  • Buder, SvenHeidelberg Univ, Int Max Planck Res, Sch Astron & Cosm Phys, Heidelberg, Germany;MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany (författare)
  • De Silva, Gayandhi M.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia (författare)
  • D'Orazi, ValentinaINAF, Vicolo Osservatorio 5, I-35122 Padua, PD, Italy (författare)
  • Freeman, KenAustralian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (författare)
  • Kos, JanezUniv Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (författare)
  • Lewis, Geraint F.Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia (författare)
  • Lin, JaneAustralian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (författare)
  • Lind, KarinUppsala universitet,Observationell astrofysik,MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany(Swepub:uu)karli488 (författare)
  • Martell, SarahARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia (författare)
  • Simpson, Jeffrey D.Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia (författare)
  • Wittenmyer, Rob A.Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia (författare)
  • Zucker, Daniel B.Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia;Macquarie Univ, Res Ctr Astron Astrophys & Astrophoton, Sydney, NSW 2109, Australia (författare)
  • Zwitter, TomazUniv Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (författare)
  • Bedding, Timothy R.Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia (författare)
  • Chen, BoquanUniv Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia (författare)
  • Cotar, KlemenUniv Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (författare)
  • Esdaile, JamesUniv New South Wales, Sch Phys, Sydney, NSW 2052, Australia (författare)
  • Horner, JonathanUniv Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia (författare)
  • Huber, DanielAarhus 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 (författare)
  • Kafle, Prajwal R.Univ Western Australia, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia (författare)
  • Khanna, ShouryaUniv Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia (författare)
  • Li, TandaUniv Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia (författare)
  • Ting, Yuan-SenInst 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 (författare)
  • Nataf, David M.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA (författare)
  • Nordlander, ThomasARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (författare)
  • Saadon, Mohd Hafiz MohdUniv New South Wales, Sch Phys, Sydney, NSW 2052, Australia (författare)
  • Traven, GregorUniv Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (författare)
  • Wright, DuncanUniv Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia (författare)
  • Wyse, Rosemary F. G.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA (författare)
  • Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia;ARC Ctr Excellence All Sky Astrophys Three Dimens, Canberra, ACT 2611, AustraliaUniv 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 (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS490:4, s. 5335-53520035-87111365-2966

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