Colors and luminosities of stars with spots

Details Colors and luminosities of stars with spots Colors and luminosities of stars with spots

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...166..167s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 166, no. 1-2, Sept. 1986, p. 167-176.

Astronomy and Astrophysics

Astrophysics

36

Main Sequence Stars, Starspots, Stellar Color, Stellar Luminosity, Stellar Models, Black Body Radiation, Stellar Activity, Stellar Structure

Scientific paper

Theoretical zero-age main sequence models from 0.2 to 1.9 solar masses have been made for stars with large sunspot-like spots, and their black body UBVRIJK colors calculated. The effect of spots is different on long and short time scales (compared with the thermal time scale of the convection zone) and differs between mainly convective and mainly radiative stars. During a short term increase in spot area the stars always become redder in all color indices, but the long term change can be either to the blue or the red, depending on stellar mass and the color index used. The anomalies in color diagrams predicted for Hyades stars are much smaller than those discussed by Campbell (1984), unless a spot coverage factor close to unity is assumed. It is suggested that these color anomalies may reflect the brightening in short wavelength bands due to chromospheric emission rather than the effect of spots themselves.

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