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Sökning: WFRF:(Minchev Ivan) > The GALAH survey :

The GALAH survey : temporal chemical enrichment of the galactic disc

Lin, Jane (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia
Asplund, Martin (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, 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
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Casagrande, Luca (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia
Buder, Sven (författare)
Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany
Bland-Hawthorn, Joss (författare)
ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia;Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Casey, Andrew R. (författare)
Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia
De Silva, Gayandhi M. (författare)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia
D'Orazi, Valentina (författare)
INAF, Osservatorio Astron Padova, Padua, Italy
Freeman, Ken C. (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia
Kos, Janez (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Lind, Karin (författare)
Uppsala universitet,Institutionen för fysik och astronomi,Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany;Uppsala Univ, Dept Phys & Astron, Observat Astrophys, Box 516, SE-75120 Uppsala, Sweden
Martell, Sarah L. (författare)
ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia;Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
Sharma, Sanjib (författare)
ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia;Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Simpson, Jeffrey D. (författare)
Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia
Zwitter, Tomaz (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Zucker, Daniel B. (författare)
Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia
Minchev, Ivan (författare)
Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
Cotar, Klemen (författare)
Univ Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia
Hayden, Michael (författare)
ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia;Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Horner, Jonti (författare)
Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia
Lewis, Geraint F. (författare)
Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
Nordlander, Thomas (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia
Wyse, Rosemary F. G. (författare)
Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
Zerjal, Marusa (författare)
Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia;ARC Ctr Excellence All Sky Astrophys 3 Dimens AST, Sydney, NSW, Australia
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 (creator_code:org_t)
2019-11-12
2020
Engelska.
Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966. ; 491:2, s. 2043-2056
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  
  • We present isochrone ages and initial bulk metallicities ([Fe/H](bulk), by accounting for diffusion) of 163 722 stars from the GALAH Data Release 2, mainly composed of main-sequence turn-off stars and subgiants (7000 K > T-eff > 4000 K and log g > 3 dex). The local age-metallicity relationship (AMR) is nearly flat but with significant scatter at all ages; the scatter is even higher when considering the observed surface abundances. After correcting for selection effects, the AMR appears to have intrinsic structures indicative of two star formation events, which we speculate are connected to the thin and thick discs in the solar neighbourhood. We also present abundance ratio trends for 16 elements as a function of age, across different [Fe/H](bulk) bins. In general, we find the trends in terms of [X/Fe] versus age from our far larger sample to be compatible with studies based on small (similar to 100 stars) samples of solar twins, but we now extend them to both sub- and supersolar metallicities. The a-elements show differing behaviour: the hydrostatic alpha-elements O and Mg show a steady decline with time for all metallicities, while the explosive alpha-elements Si, Ca, and Ti are nearly constant during the thin-disc epoch (ages less than or similar to 12 Gyr). The s-process elements Y and Ba show increasing [X/Fe] with time while the r-process element Eu has the opposite trend, thus favouring a primary production from sources with a short time delay such as core-collapse supernovae over long-delay events such as neutron star mergers.

Ämnesord

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

Nyckelord

stars: abundances
stars: fundamental parameters
solar neighbourhood

Publikations- och innehållstyp

ref (ämneskategori)
art (ämneskategori)

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