A library of theoretical stellar flux spectra. I - Synthetic UBVRI photometry and the metallicity scale for F- to K-type stars

Details A library of theoretical stellar flux spectra. I - Synthetic UBVRI photometry and the metallicity scale for F- to K-type stars A library of theoretical stellar flux spectra. I - Synthetic UBVRI photometry and the metallicity scale for F- to K-type stars

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...264..557b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 264, no. 2, p. 557-591.

Astronomy and Astrophysics

Astrophysics

181

F Stars, K Stars, Late Stars, Metallicity, Stellar Spectra, Ubv Spectra, Dwarf Stars, Stellar Color, Stellar Spectrophotometry

Scientific paper

Synthetic colors on the Johnson-Cousins standard UBVRI system of a grid of theoretical model atmosphere flux distributions for late-type stars are presented. These colors are based on new synthetic spectra calculated from the flux-constant, blanketed model atmospheres of Gustafsson et al. (1975) and Eriksson et al. (1979). The present calculations substantially reduce the systematic effects of the 'missing UV opacity' present in the synthetic colors computed by Bell & Gustafsson (1978) and by VandenBerg & Bell (1985), who employed the same models but different opacity source input. The new fluxes provide significantly improved theoretical representations of the observed two-color diagrams and the empirical temperature calibrations for F-, G-, and K-type stars of all luminosities and metallicities. The present models for F- to K-stars provide an extensive quasi-homogeneous grid of low-resolution theoretical flux spectra for a significant range in stellar parameters covering most of the observed HR diagram.

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