Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...328..565e&link_type=abstract
Astronomy and Astrophysics, v.328, p.565-570 (1997)
Astronomy and Astrophysics
Astrophysics
10
Stars: Activity, Stars: Coronae, Stars: Flare, Stars: Individual: Hu Vir, X-Rays: Stars
Scientific paper
We present two ROSAT-HRI observations of the RS CVn-type binary HU Virginis (=HD 106225). The first observation covers almost three consecutive rotation cycles of HU Virginis or a total of 26.7 days and an exposure time of 35 ksec. On JD 2,449,544 a long duration flare was detected and observed for 1.5 days. This event was releasing a total energy of ~ 7.7(+3.3}_{-1.9) x 10(36) erg in the 0.1-2.4 keV bandpass. The good coverage of the onset and maximum phase of the flare light curve allowed a detailed comparison with two solar flare models. We derived an estimate for the size of the active region responsible for the flare. The resulting loop size is of the order of one stellar radius. One year later, in 1995, HU Virginis was again observed by ROSAT continuously for 8 days and a total exposure time of 69 ksec. The X-ray flux shows variability on time scales shorter than the rotational period.
Endl Michael
Kürster Martin
Strassmeier Klaus G.
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