Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003csss...12..285m&link_type=abstract
The Future of Cool-Star Astrophysics: 12th Cambridge Workshop on Cool Stars , Stellar Systems, and the Sun (2001 July 30 - Augus
Astronomy and Astrophysics
Astrophysics
2
Hd 131156, Stellar Atmosphere, Far-Uv, Temperature Structure
Scientific paper
Investigations of IUE ultraviolet spectra of field G and K-type stars (Morossi et al. 1993, Morossi et al. 1998, Franchini et al. 1998a) showed that the spectral energy distributions (SED's) of cool stars present a significant excess in the UV with respect to the fluxes predicted by the atmosphere models characterized by a monotonic decrease of temperature. We combine HST, IUE and visual observations to construct accurate SED's to be used for deriving empirical estimate of the temperature distribution in the atmosphere of G-type stars. Template objects are used to compare pure LTE model predictions with those from semi-empirical structures designed for the solar case (Vernazza et al. 1981). Particular attention is devoted to the determination of the position of the temperature minimum layer by computing ``semi-empirical Tmin models'' (Morossi et al. 1993 and Franchini et al. 1998b).
Chavez M. A.
Franchini Marco
Malagnini Maria Lucia
Morossi Carlo
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