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1998ApJ...508..370F - Astrophys. J., 508, 370-379 (1998/November-3)

Far-ultraviolet continuum of G-type stars: a signature of the temperature minimum region.


Abstract (from CDS):

The main results of a program of systematic comparison between observed and computed UV spectral energy distributions of field G-type stars are illustrated. We constructed the UV observed energy distributions for 53 G stars, starting from the IUE Uniform Low Dispersion Archive (ULDA) and computed the corresponding theoretical fluxes by using the atmospheric parameters from the Catalogue of [Fe/H] Determinations (1996 edition) and a Kurucz grid of model fluxes. From the comparison between observations and classical models, a UV excess shortward of 2000 Å is evident for all the program stars. The UV continuum in the region 1600-2000 Å can be described by synthetic fluxes computed from semiempirical models based on the temperature minimum concept. Values for the Tmin/Teff ratio on the order of 0.80 are suitable for the interpretation of the observed fluxes. The residual discrepancies shortward of 1600 Å are suggested to be effects of the chromosphere, on the basis of a comparison with the Maltby et al. semiempirical model of the Sun.

Abstract Copyright:

Journal keyword(s): Stars: Atmospheres - Stars: Chromospheres - Stars: Late-Type - Ultraviolet: Stars

Simbad objects: 54

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