Effect of chromospheric activity on the mean colours of late-type stars.

Details Effect of chromospheric activity on the mean colours of late-type stars. Effect of chromospheric activity on the mean colours of late-type stars.

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...319..967a&link_type=abstract

Astronomy and Astrophysics, v.319, p.967-972

Astronomy and Astrophysics

Astrophysics

29

Stars: Activity, Stars: Fundamental Parameters, Stars: Late-Type

Scientific paper

In this paper we show, for the first time, the effect of activity on the (U-B)_0_ vs. (B-V)_0_ colour-colour diagram for a large sample of late type stars. We clearly see that for single-lined spectroscopic RSCVn systems there exists an ultraviolet excess over that recorded for quiescent stars of the same spectral type. The same effect is seen in main-sequence stars but to a lesser extent. From simple arguments we demonstrate that the cause is unlikely to be unresolved flaring, the combined effect of strong chromospheric emission lines, or X-ray/UV back-heating of the photosphere. White-light faculae are a reasonable candidate for the effect however. In our investigation we have not taken into account the effect that metallicity might have on the colour indices.

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