The GALAH+ survey: Third data release. Issue 1 (6th May 2021)
- Record Type:
- Journal Article
- Title:
- The GALAH+ survey: Third data release. Issue 1 (6th May 2021)
- Main Title:
- The GALAH+ survey: Third data release
- Authors:
- Buder, Sven
Sharma, Sanjib
Kos, Janez
Amarsi, Anish M
Nordlander, Thomas
Lind, Karin
Martell, Sarah L
Asplund, Martin
Bland-Hawthorn, Joss
Casey, Andrew R
De Silva, Gayandhi M
D'Orazi, Valentina
Freeman, Ken C
Hayden, Michael R
Lewis, Geraint F
Lin, Jane
Schlesinger, Katharine J
Simpson, Jeffrey D
Stello, Dennis
Zucker, Daniel B
Zwitter, Tomaž
Beeson, Kevin L
Buck, Tobias
Casagrande, Luca
Clark, Jake T
Čotar, Klemen
Da Costa, Gary S
de Grijs, Richard
Feuillet, Diane
Horner, Jonathan
Kafle, Prajwal R
Khanna, Shourya
Kobayashi, Chiaki
Liu, Fan
Montet, Benjamin T
Nandakumar, Govind
Nataf, David M
Ness, Melissa K
Spina, Lorenzo
Tepper-García, Thor
Ting(丁源森), Yuan-Sen
Traven, Gregor
Vogrinčič, Rok
Wittenmyer, Robert A
Wyse, Rosemary F G
Žerjal, Maruša
… (more) - Abstract:
- ABSTRACT: The ensemble of chemical element abundance measurements for stars, along with precision distances and orbit properties, provides high-dimensional data to study the evolution of the Milky Way. With this third data release of the Galactic Archaeology with HERMES (GALAH) survey, we publish 678 423 spectra for 588 571 mostly nearby stars (81.2 per cent of stars are within <2 kpc), observed with the HERMES spectrograph at the Anglo-Australian Telescope. This release (hereafter GALAH+ DR3) includes all observations from GALAH Phase 1 (bright, main, and faint survey, 70 per cent), K2-HERMES (17 per cent), TESS-HERMES (5 per cent), and a subset of ancillary observations (8 per cent) including the bulge and >75 stellar clusters. We derive stellar parameters T eff, log g, [Fe/H], v mic, v broad, and v rad using our modified version of the spectrum synthesis code Spectroscopy Made Easy (sme ) and 1D marcs model atmospheres. We break spectroscopic degeneracies in our spectrum analysis with astrometry from Gaia DR2 and photometry from 2MASS. We report abundance ratios [X/Fe] for 30 different elements (11 of which are based on non-LTE computations) covering five nucleosynthetic pathways. We describe validations for accuracy and precision, flagging of peculiar stars/measurements and recommendations for using our results. Our catalogue comprises 65 per cent dwarfs, 34 per cent giants, and 1 per cent other/unclassified stars. Based on unflagged chemical composition and age, weABSTRACT: The ensemble of chemical element abundance measurements for stars, along with precision distances and orbit properties, provides high-dimensional data to study the evolution of the Milky Way. With this third data release of the Galactic Archaeology with HERMES (GALAH) survey, we publish 678 423 spectra for 588 571 mostly nearby stars (81.2 per cent of stars are within <2 kpc), observed with the HERMES spectrograph at the Anglo-Australian Telescope. This release (hereafter GALAH+ DR3) includes all observations from GALAH Phase 1 (bright, main, and faint survey, 70 per cent), K2-HERMES (17 per cent), TESS-HERMES (5 per cent), and a subset of ancillary observations (8 per cent) including the bulge and >75 stellar clusters. We derive stellar parameters T eff, log g, [Fe/H], v mic, v broad, and v rad using our modified version of the spectrum synthesis code Spectroscopy Made Easy (sme ) and 1D marcs model atmospheres. We break spectroscopic degeneracies in our spectrum analysis with astrometry from Gaia DR2 and photometry from 2MASS. We report abundance ratios [X/Fe] for 30 different elements (11 of which are based on non-LTE computations) covering five nucleosynthetic pathways. We describe validations for accuracy and precision, flagging of peculiar stars/measurements and recommendations for using our results. Our catalogue comprises 65 per cent dwarfs, 34 per cent giants, and 1 per cent other/unclassified stars. Based on unflagged chemical composition and age, we find 62 per cent young low-$\alpha$, 9 per cent young high-$\alpha$, 27 per cent old high-$\alpha$, and 2 per cent stars with [Fe/H] ≤ −1. Based on kinematics, 4 per cent are halo stars. Several Value-Added-Catalogues, including stellar ages and dynamics, updated after Gaia eDR3, accompany this release and allow chrono-chemodynamic analyses, as we showcase. … (more)
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 506:Issue 1(2021)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 506:Issue 1(2021)
- Issue Display:
- Volume 506, Issue 1 (2021)
- Year:
- 2021
- Volume:
- 506
- Issue:
- 1
- Issue Sort Value:
- 2021-0506-0001-0000
- Page Start:
- 150
- Page End:
- 201
- Publication Date:
- 2021-05-06
- Subjects:
- methods: data analysis -- methods: observational -- surveys -- stars: abundances -- stars: fundamental parameters
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stab1242 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 25316.xml