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We compile a sample of Sun-like stars with accurate effective temperatures, metallicities and colours (from the ultraviolet to the near-infrared). A crucial improvement is that the effective temperature scale of the stars has recently been established as both accurate and precise through direct measurement of angular diameters obtained with stellar interferometers. We fit the colours as a function of effective temperature and metallicity, and derive colour estimates for the Sun in the Johnson-Cousins, Tycho, Strmgren, 2MASS and SDSS photometric systems. For (B -V ) , we favour the 'red' colour 0.64 versus the 'blue' colour 0.62 of other recent papers, but both values are consistent within the errors; we ascribe the difference to the selection of Sun-like stars versus interpolation of wider colour-T eff -metallicity relations.
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Johan Holmberg
University of Copenhagen
Chris Flynn
Australian Research Council
L. Portinari
University of Turku
Monthly Notices of the Royal Astronomical Society
Vaisala (Finland)
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Holmberg et al. (Tue,) studied this question.
synapsesocial.com/papers/6a1e969087ef3f90e202b158 — DOI: https://doi.org/10.1111/j.1365-2966.2005.09832.x
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