Bolometric correction and spectral energy distribution of cool stars in Galactic clusters

Details Bolometric correction and spectral energy distribution of cool stars in Galactic clusters Bolometric correction and spectral energy distribution of cool stars in Galactic clusters

2010-02-09

arxiv.org/abs/1002.1972v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

18 pages with 12 color figures and 12 tables. To appear in the MNRAS. Full spectral catalog of stars available at http://www

Scientific paper

We have investigated the relevant trend of the bolometric correction (BC) at the cool-temperature regime of red giant stars and its possible dependence on stellar metallicity. Our analysis relies on a wide sample of optical-infrared spectroscopic observations, along the 3500A-2.5micron wavelength range, for a grid of 92 red giant stars in five (3 globular + 2 open) Galactic clusters, along the -2.2<[Fe/H]<+0.4 metallicity range. Bolometric magnitudes have been found within an internal accuracy of a few percent. Making use of our new database, we provide a set of fitting functions for the V and K BC vs. Teff and broad-band colors, valid over the interval 3300K

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