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  • Buder, SvenMPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany;Heidelberg Univ, Int Max Planck Res Sch Astron & Cosm Phys, Heidelberg, Germany (author)

The GALAH Survey : second data release

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018-05-16
  • OXFORD UNIV PRESS,2018
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:uu-362840
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-362840URI
  • https://doi.org/10.1093/mnras/sty1281DOI

Supplementary language notes

  • Language:English
  • Summary in:English &language:-1_t

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  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • The Galactic Archaeology with HERMES (GALAH) survey is a large-scale stellar spectroscopic survey of the Milky Way, designed to deliver complementary chemical information to a large number of stars covered by the Gaia mission. We present the GALAH second public data release (GALAH DR2) containing 342 682 stars. For these stars, the GALAH collaboration provides stellar parameters and abundances for up to 23 elements to the community. Here we present the target selection, observation, data reduction, and detailed explanation of how the spectra were analysed to estimate stellar parameters and element abundances. For the stellar analysis, we have used a multistep approach. We use the physics-driven spectrum synthesis of Spectroscopy Made Easy (SME) to derive stellar labels (T-eff, log g, [Fe/H], [X/Fe], v(mic), vsin i, AKS) for a representative training set of stars. This information is then propagated to the whole sample with the data-driven method of The Cannon. Special care has been exercised in the spectral synthesis to only consider spectral lines that have reliable atomic input data and are little affected by blending lines. Departures from local thermodynamic equilibrium (LTE) are considered for several key elements, including Li, O, Na, Mg, Al, Si, and Fe, using 1D MARCS stellar atmosphere models. Validation tests including repeat observations, Gaia benchmark stars, open and globular clusters, and K2 asteroseismic targets lend confidence to our methods and results. Combining the GALAH DR2 catalogue with the kinematic information from Gaia will enable a wide range of Galactic Archaeology studies, with unprecedented detail, dimensionality, and scope.

Subject headings and genre

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  • Asplund, MartinCtr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Duong, Ly (author)
  • Kos, JanezUniv Sydney, Sydney Inst Astron, Sch Phys, A28, Sydney, NSW 2006, Australia (author)
  • Lind, KarinUppsala universitet,Observationell astrofysik,MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany(Swepub:uu)karli488 (author)
  • Ness, Melissa K.Columbia Univ, Dept Astron, Pupin Phys Labs, New York, NY 10027 USA;Flatiron Inst, Ctr Computat Astrophys, 162 Fifth Ave, New York, NY 10010 USA (author)
  • Sharma, SanjibUniv Sydney, Sydney Inst Astron, Sch Phys, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia (author)
  • Bland-Hawthorn, JossUniv Sydney, Sydney Inst Astron, Sch Phys, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Univ Calif Berkeley, Miller Inst, Berkeley, CA 94720 USA (author)
  • Casey, Andrew R.Monash Univ, Monash Ctr Astrophys, Clayton, Vic 3800, Australia;Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia (author)
  • De Silva, Gayandhi M.Univ Sydney, Sydney Inst Astron, Sch Phys, A28, Sydney, NSW 2006, Australia;Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia (author)
  • D'Orazi, ValentinaIst Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy (author)
  • Freeman, Ken C.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Lewis, Geraint F.Univ Sydney, Sydney Inst Astron, Sch Phys, A28, Sydney, NSW 2006, Australia (author)
  • Lin, JaneCtr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Martell, Sarah L.UNSW, Sch Phys, Sydney, NSW 2052, Australia (author)
  • Schlesinger, Katharine J.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Simpson, Jeffrey D.Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia (author)
  • Zucker, Daniel B.Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia;Macquarie Univ, Dept Phys & Astron, Sydney, NSW 2109, Australia (author)
  • Zwitter, TomazUniv Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (author)
  • Amarsi, Anish M.MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany(Swepub:uu)aniam456 (author)
  • Anguiano, BorjaUniv Virginia, Dept Astron, Charlottesville, VA 22904 USA (author)
  • Carollo, DanielaINAF, Astrophys Observ Turin, Turin, Italy (author)
  • Casagrande, LucaCtr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Cotar, KlemenUniv Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (author)
  • Cottrell, Peter L.Univ Canterbury, Sch Phys & Chem Sci, Christchurch, New Zealand;Monash Univ, Sch Phys & Astron, Clayton, Vic 3800, Australia (author)
  • Da Costa, GaryAustralian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Gao, Xudong D.MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany (author)
  • Hayden, Michael R.Univ Sydney, Sydney Inst Astron, Sch Phys, A28, Sydney, NSW 2006, Australia;Ctr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia (author)
  • Horner, JonathanUniv Southern Queensland, Toowoomba, Qld 4350, Australia (author)
  • Ireland, Michael J.Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Kafle, Prajwal R.Univ Western Australia, ICRAR, 35 Stirling Highway, Crawley, WA 6009, Australia (author)
  • Munari, UlisseINAF Astron Observ Padova, I-36012 Asiago, Italy (author)
  • Nataf, David M.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA (author)
  • Nordlander, ThomasCtr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Stello, DennisCtr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, DK-8000 Aarhus C, Denmark;UNSW, Sch Phys, Sydney, NSW 2052, Australia (author)
  • Ting, Yuan-SenObserv Carnegie Inst Washington, 813 Santa Barbara St, Pasadena, CA 91101 USA;Inst Adv Study, Olden Lane, Princeton, NJ 08540 USA;Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA (author)
  • Traven, GregorUniv Ljubljana, Fac Math & Phys, Jadranska 19, Ljubljana 1000, Slovenia (author)
  • Watson, FredWestern Sydney Univ, Locked Bag 1797, Penrith, NSW 2751, Australia;Australian Astron Observ, 105 Delhi Rd, N Ryde, NSW 2113, Australia (author)
  • Wittenmyer, Robert A.Univ Southern Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld 4350, Australia (author)
  • Wyse, Rosemary F. G.Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA (author)
  • Yong, DavidAustralian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • Zinn, Joel C.Ohio State Univ, Dept Astron, 140 West 18th Ave, Columbus, OH 43210 USA (author)
  • Zerjal, MarusaAustralian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (author)
  • MPIA, Koenigstuhl 17, D-69117 Heidelberg, Germany;Heidelberg Univ, Int Max Planck Res Sch Astron & Cosm Phys, Heidelberg, GermanyCtr Excellence Astrophys Three Dimens ASTRO 3D, Sydney, NSW, Australia;Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia (creator_code:org_t)

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  • In:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS478:4, s. 4513-45520035-87111365-2966

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