Stroemgren four-color photometry of X-ray active late-type stars: Evidence for activity-induced deficiency in the m_1_ index.

Details Stroemgren four-color photometry of X-ray active late-type stars: Evidence for activity-induced deficiency in the m_1_ index. Stroemgren four-color photometry of X-ray active late-type stars: Evidence for activity-induced deficiency in the m_1_ index.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..119..403m&link_type=abstract

Astronomy and Astrophysics Supplement, v.119, p.403-412

Astronomy and Astrophysics

Astrophysics

20

Stars: Activity, Stars: Late-Type, Stars: Abundances, X-Rays: Stars

Scientific paper

We present the results of a uvby-β photometric study of a sample of active late-type stars (F-K) selected from the Einstein Extended Medium Sensitivity Survey. Our work shows the presence in the sample of a star population with the photometric index c_1_ typical of main sequence stars and an unexpected deficiency in m_1_ index. Stars with more anomalous values of m_1_ have also very high values of f_ X_/f_V_ and X-ray surface fluxes, near the "saturation" limit observed in the most active stars and similar to the flux observed in solar active regions. We discuss these results in the light of similar results found in the Sun comparing m_1_ indices in quiet and active regions and in other samples of active stars.

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