The GALAH survey: Effective temperature calibration from the InfraRed Flux Method in the Gaia system
| Autor: | Sven Buder, Yuan-Sen Ting, Robert A. Wittenmyer, Joss Bland-Hawthorn, Thomas Nordlander, Kenneth C. Freeman, Martin Asplund, Sarah L. Martell, Janez Kos, Sanjib Sharma, Katharine J. Schlesinger, Jeffrey D. Simpson, Andrew R. Casey, Jonathan Horner, Dennis Stello, Gayandhi M. De Silva, Valentina D'Orazi, Jane Lin, Adam D. Rains, Geraint F. Lewis, Luca Casagrande, Daniel B. Zucker, F. Liu, Tomaž Zwitter, Karin Lind, Michael R. Hayden |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Metallicity
Extinction (astronomy) FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Stellar classification 01 natural sciences 0103 physical sciences Calibration Astrophysics::Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics 010308 nuclear & particles physics Astronomy and Astrophysics Effective temperature Surface gravity Astrophysics - Astrophysics of Galaxies Photometry (astronomy) Stars Astrophysics - Solar and Stellar Astrophysics 13. Climate action Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics Astrophysics - Instrumentation and Methods for Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society |
| Popis: | 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 to 8000 kelvin, from very metal-poor stars to super solar metallicities. The internal uncertainty of these calibrations is of order 40-80 kelvin 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. MNRAS accepted. Include Gaia solar colours. Colour-effective temperature routines for Gaia DR2 and DR3 system available at https://github.com/casaluca/colte |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|