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• W2160168093 abstract "<i>Context. <i/>The effective temperature scale of FGK stars, especially at the lowest metallicities remains a major problem in the chemical abundance analysis of metal-poor stars.<i>Aims. <i/>We present a new implementation of the infrared flux method (IRFM) using the 2MASS catalogue.<i>Methods. <i/>We computed the theoretical quantities in the 2MASS <i>JHK<i/><sub>s<sub/> filters by integrating theoretical fluxes computed from ATLAS models, and compare them directly with the observed 2MASS <i>JHK<i/><sub>s<sub/> magnitudes. This is the main difference between our implementation of the IRFM and that of Ramírez & Meléndez (2005, ApJ, 626, 446, hereafter RM05), since to introduce new stars at the lowest metallicities they transform the 2MASS <i>JHK<i/><sub>s<sub/> magnitudes into the TCS photometric system. We merge in our sample the stars from Alonso et al. (1996, A&AS, 117, 227, hereafter AAM96; 1999, A&AS, 139, 335, hereafter AAM99), and other studies to appropriately cover a wide range of metallicities, ending up with 555 dwarf and subgiant field stars and 264 giant field stars. We derived a new bolometric flux calibration using the available Johnson-Cousins and the 2MASS <i>JHK<i/><sub>s<sub/> photometry. We also computed new versus colour empirical calibrations using our extended sample of stars.<i>Results. <i/>We derived effectives temperatures for almost all the stars in the AAM96 and AAM99 samples and find that our scales of temperature are hotter by K ( K, dwarfs) and K with a K ( giants). The same comparison with the sample of RM05 for stars with [Fe/H] provides a difference of –87 K ( K, dwarf stars) and K ( K, giant stars). <i>Conclusions. <i/>Our temperature scale is slightly hotter than that of AAM96 and RM05 for metal-rich dwarf stars but cooler than that of RM05 for metal-poor dwarfs. We have performed an fully self-consistent IRFM in the 2MASS photometric system. For those who wish to use 2MASS photometry and colour-temperature calibrations to derive effective temperatures, especially for metal-poor stars, we recommend our calibrations over others available in the literature. In our implementation we avoid the transformation of the 2MASS magnitudes to a different photometric system and thus fully exploit the excellent internal consistency of the 2MASS photometric system." @default.
• W2160168093 created "2016-06-24" @default.
• W2160168093 creator A5051848532 @default.
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• W2160168093 date "2009-03-05" @default.
• W2160168093 modified "2023-10-16" @default.
• W2160168093 title "A new implementation of the infrared flux method using the 2MASS catalogue" @default.
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• W2160168093 doi "https://doi.org/10.1051/0004-6361/200810904" @default.
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