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Combined $$\mathrm{APOGEE}$$-$$\mathrm{GALAH}$$ stellar catalogues using the Cannon

Journal Article · · Monthly Notices of the Royal Astronomical Society
 [1];  [2];  [2];  [1];  [3];  [2];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [1];  [9];  [11];  [7];  [1];  [1];  [12] more »;  [7];  [13];  [14];  [15] « less
  1. Australian National University, Canberra, ACT (Australia); Centre of Excellence for Astrophysics in Three Dimensions (ASTRO-3D) (Australia)
  2. Centre of Excellence for Astrophysics in Three Dimensions (ASTRO-3D) (Australia); University of Sydney, NSW (Australia)
  3. Max Planck Institute for Astrophysics, Garching (Germany)
  4. Macquarie University, Macquarie Park (Australia); Macquarie University Research Centre for Astronomy, Astrophysics & Astrophotonics, Sydney, NSW (Australia)
  5. National Institute of Astrophysics, Astronomical Observatory of Padua (Italy)
  6. Australian National University, Canberra, ACT (Australia)
  7. University of Ljubljana (Slovenia)
  8. University of Sydney, NSW (Australia)
  9. Centre of Excellence for Astrophysics in Three Dimensions (ASTRO-3D) (Australia); University of New South Wales, Sydney, NSW (Australia)
  10. Research School of Astronomy & Astrophysics, Australian National University, ACT 2611, Australia
  11. Macquarie University Research Centre for Astronomy, Astrophysics & Astrophotonics, Sydney, NSW (Australia); Macquarie University, NSW (Australia)
  12. Stockholm University (Sweden)
  13. Centre of Excellence for Astrophysics in Three Dimensions (ASTRO-3D) (Australia); University of Sydney, NSW (Australia); University of New South Wales, Sydney, NSW (Australia)
  14. University of Southern Queensland, Toowoomba, QLD (Australia)
  15. Centre of Excellence for Astrophysics in Three Dimensions (ASTRO-3D) (Australia); University of Sydney, NSW (Australia); University of Sydney, NSW (Australia)
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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.
Research Organization:
Australian National University, Canberra, ACT (Australia); US Department of Energy (USDOE), Washington, DC (United States). Office of Science, Sloan Digital Sky Survey (SDSS)
Sponsoring Organization:
Alfred P. Sloan Foundation; USDOE Office of Science (SC); University of Utah
OSTI ID:
1982706
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 513; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (26)

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Figure A3(p. 24)figure Figure A3
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Figure A5(p. 24)figure Figure A5

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
abundances
disc
evolution
formation
galaxy
stars
structure
surveys