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

Casagrande, Luca and Lin, Jane and Rains, Adam D. and Liu, Fan and Buder, Sven and Horner, Jonathan and Asplund, Martin and Lewis, Geraint F. and Martell, Sarah L. and Nordlander, Thomas and Stello, Dennis and Ting, Yuan-Sen and Wittenmyer, Robert A. and Bland-Hawthorn, Joss and Casey, Andrew R. and De Silva, Gayandhi M. and D'Orazi, Valentina and Freeman, Ken C. and Hayden, Michael R. and Kos, Janez and Lind, Karin and Schlesinger, Katharine J. and Sharma, Sanjib and Simpson, Jeffrey D. and Zucker, Daniel B. and Zwitter, Tomaz (2021) The GALAH survey: effective temperature calibration from the InfraRed Flux Method in the Gaia system. Monthly Notices of the Royal Astronomical Society, 507 (2). pp. 2684-2696. ISSN 0035-8711

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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 360000 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 4000K less than or similar to T-eff less than or similar to 8000 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 10 Jan 2022 03:29
Last Modified: 12 Jan 2022 03:31
Uncontrolled Keywords: techniques: photometric; stars: abundances; stars: atmospheres; stars: fundamental parameters; stars: Hertzsprung-Russell and colour-; magnitude diagrams; infrared: stars; Astrophysics - Solar and Stellar; Astrophysics; Astrophysics - Astrophysics of Galaxies; Astrophysics -; Instrumentation and Methods for Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/stab2304
URI: http://eprints.usq.edu.au/id/eprint/44806

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