Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403..155g&link_type=abstract
Astronomy and Astrophysics, v.403, p.155-171 (2003)
Astronomy and Astrophysics
Astrophysics
16
Stars: Activity, Stars: Coronae, Stars: Individual: Alpha Crb
Scientific paper
We interpret the X-ray light curve obtained by XMM-Newton during a total X-ray eclipse in the nearby binary star alpha Coronae Borealis. This system consists of a G5 V main-sequence star orbiting an X-ray dark A0 star. The secondary G star is a young, active solar analog with an age of a few 100 Myr. As the primary A star eclipses active regions on the X-ray bright companion, the light curve drops in consecutive steps to zero; as individual active regions reappear during egress, the flux rises in similar steps. The ingress and egress light curves are combined to reconstruct the 2D distribution of X-ray brightness on and around the G star. Three different methods are applied, and variations due to statistical noise and uncertainties in the binary system parameters are discussed. Although the solutions are non-unique, all reconstructions reveal a similar distribution of X-ray bright regions and large areas with little flux. We present plausible estimates of (lower limits to) the electron densities in the bright regions, obtaining characteristic values between 109-3x 1010 cm-3.
Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).
Arzner Kaspar
Audard Marc
Güdel Manuel
Mewe Rolf
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