Combined APOGEE-GALAH stellar catalogues using the Cannon
Article
Article Title | Combined APOGEE-GALAH stellar catalogues using the Cannon |
---|---|
ERA Journal ID | 1074 |
Article Category | Article |
Authors | Nandakumar, Govind (Author), Hayden, Michael R. (Author), Sharma, Sanjib (Author), Buder, Sven (Author), Asplund, Martin (Author), Bland-Hawthorn, Joss (Author), De Silva, Gayandhi M. (Author), D'Orazi, Valentina (Author), Freeman, Ken C. (Author), Kos, Janez (Author), Lewis, Geraint F. (Author), Martell, Sarah L. (Author), Schlesinger, Katharine J. (Author), Lin, Jane (Author), Simpson, Jeffrey D. (Author), Zucker, Daniel B. (Author), Zwitter, Tomaž (Author), Nordlander, Thomas (Author), Casagrande, Luca (Author), Lind, Karin (Author), Cotar, Klemen (Author), Stello, Dennis (Author), Wittenmyer, Robert A. (Author) and Tepper-Garcia, Thor (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 513 (1), pp. 232-255 |
Number of Pages | 24 |
Year | 2022 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/stac873 |
Web Address (URL) | https://academic.oup.com/mnras/article/513/1/232/6561633 |
Abstract | APOGEE and GALAH are two high resolution multi-object spectroscopic surveys that provide fundamental stellar parameters and multiple elemental abundance estimates for about half a million stars in the Milky Way. Both surveys observe in different wavelength regimes and use different data reduction pipelines leading to significant offsets and trends in stellar parameters and abundances for the common stars observed in both surveys. Such systematic differences/offsets in stellar parameters and abundances make it difficult to effectively utilize them to investigate Galactic abundance trends in spite of the unique advantage provided by their complementary sky coverage and different Milky Way components they observe. Hence, we use the Cannon data-driven method selecting a training set of 4418 common stars observed by both surveys. This enables the construction of two catalogues, one with the APOGEE-scaled and the other with the GALAH-scaled stellar parameters. Using repeat observations in APOGEE and GALAH, we find high precision in metallicity (~0.02-0.4 dex) and alpha abundances (~0.02-0.03 dex) for spectra with good signal-to-noise ratio (SNR > 80 for APOGEE and SNR > 40 for GALAH). We use open and globular clusters to validate our parameter estimates and find small scatter in metallicity (0.06 dex) and alpha abundances (0.03 dex) in APOGEE-scaled case. The final catalogues have been cross-matched with the Gaia EDR3 catalogue to enable their use to carry out detailed chemo-dynamic studies of the Milky Way from perspectives of APOGEE and GALAH. |
Keywords | surveys; stars: abundances; Galaxy: disc; Galaxy: evolution; Galaxy:; formation; Galaxy: structure |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2022 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Australian National University |
ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
Max Planck Society, Germany | |
Macquarie University | |
National Institute for Astrophysics, Italy | |
University of Ljubljana, Slovenia | |
University of Sydney | |
Stockholm University, Sweden | |
Centre for Astrophysics |
https://research.usq.edu.au/item/q77vx/combined-apogee-galah-stellar-catalogues-using-the-cannon
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