The GALAH survey: effective temperature calibration from the InfraRed Flux Method in the Gaia system

Author:

Casagrande Luca12ORCID,Lin Jane12,Rains Adam D1ORCID,Liu Fan3ORCID,Buder Sven12ORCID,Horner Jonathan4ORCID,Asplund Martin5,Lewis Geraint F6ORCID,Martell Sarah L72ORCID,Nordlander Thomas12ORCID,Stello Dennis72,Ting Yuan-Sen128910,Wittenmyer Robert A4,Bland-Hawthorn Joss26ORCID,Casey Andrew R1112ORCID,De Silva Gayandhi M1314,D’Orazi Valentina15,Freeman Ken C1,Hayden Michael R26,Kos Janez16,Lind Karin17,Schlesinger Katharine J1,Sharma Sanjib26ORCID,Simpson Jeffrey D27ORCID,Zucker Daniel B1814,Zwitter Tomaž16ORCID

Affiliation:

1. Research School of Astronomy and Astrophysics, The Australian National University, Canberra, ACT 2611, Australia

2. ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), Australia

3. Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Melbourne, VIC 3122, Australia

4. Centre for Astrophysics, University of Southern Queensland, Toowoomba, QLD 4350, Australia

5. Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str 1, D-85748 Garching, Germany

6. Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006, Australia

7. School of Physics, UNSW, Sydney, NSW 2052, Australia

8. Institute for Advanced Study, Princeton, NJ 08540, USA

9. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA

10. Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

11. Monash Centre for Astrophysics, Monash University, 3800, Australia

12. School of Physics and Astronomy, Monash University, 3800, Australia

13. Australian Astronomical Optics, Faculty of Science and Engineering, Macquarie University, Macquarie Park, NSW 2113, Australia

14. Macquarie University Research Centre for Astronomy, Astrophysics & Astrophotonics, Sydney, NSW 2109, Australia

15. Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122 Padova, Italy

16. Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia

17. Department of Astronomy, Stockholm University, AlbaNova University Centre, SE-106 91 Stockholm, Sweden

18. Department of Physics and Astronomy, Macquarie University, Sydney, NSW 2109, Australia

Abstract

ABSTRACT In order to accurately determine stellar properties, knowledge of the effective temperature of stars is vital. We implement Gaia and 2MASS photometry in the InfraRed Flux Method and apply it to over 360 000 stars across different evolutionary stages in the GALAH DR3 survey. We derive colour-effective temperature relations that take into account the effect of metallicity and surface gravity over the range $4000\, \rm {K}\lesssim T_{\rm {eff}}\lesssim 8000\, \rm {K}$, from very metal-poor stars to supersolar metallicities. The internal uncertainty of these calibrations is of order 40–80 K depending on the colour combination used. Comparison against solar-twins, Gaia benchmark stars, and the latest interferometric measurements validates the precision and accuracy of these calibrations from F to early M spectral types. We assess the impact of various sources of uncertainties, including the assumed extinction law, and provide guidelines to use our relations. Robust solar colours are also derived.

Funder

ARC

NASA

Slovenian Research Agency

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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