ROSAT and AB Doradus: the first five years.

Details ROSAT and AB Doradus: the first five years. ROSAT and AB Doradus: the first five years.

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...320..831k&link_type=abstract

Astronomy and Astrophysics, v.320, p.831-839

Astronomy and Astrophysics

Astrophysics

91

Stars: Coronae, Stars: Activity, Stars: Rotation, Stars: Individual: Ab Dor, X-Rays: Stars

Scientific paper

Five and a half years of data from an extensive ROSAT X-ray monitoring program devoted to the young K-star AB Dor are presented. Begun in mid-1990, this program is aimed at the study of the long-term behaviour of coronal flux levels in this very active star. We compare the X-ray data with 17 years of V-band brightness monitoring that shows a 10-year decline between 1978 and 1989 and a subsequent rise phase. In contrast, the X-ray flux, which is very variable on time scales of minutes to weeks, exhibits no pronounced long-term trend over the 5 1/2-years of the program. This supports the concept of a saturated corona. Making use of the ROSAT all-sky survey data and data from the most extensive among the available pointed observations we also discuss the short-term variablity in relation to the rotational time scale. We find evidence for a partial rotational modulation of the X-ray flux implying structural inhomogeneities in this saturated corona.

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