The colours of the Sun

Details The colours of the Sun The colours of the Sun

2005-11-06

arxiv.org/abs/astro-ph/0511158v1

Mon.Not.Roy.Astron.Soc.367:449-453,2006

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted by MNRAS

Scientific paper

10.1111/j.1365-2966.2005.09832.x

We compile a sample of Sun-like stars with accurate effective temperatures, metallicities and colours (from the UV to the near-IR). 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, Stromgren, 2MASS and SDSS photometric systems. For (B-V)_Sun, 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-Teff-metallicity relations.

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