2003/04/29 by M. Güdel, K. Arzner, M. Audard +1 · 1 citation
Physics and Astronomy · Earth and Planetary Sciences · #Astrophysical Phenomena and Observations #High-pressure geophysics and materials #Stellar, planetary, and galactic studies
paper · pdf · doi:10.1051/0004-6361:20030257
openalex publication_date 2003/04/29 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
We interpret the X-ray light curve obtained by XMM-Newton during a total X-ray eclipse in the nearby binary star α 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– cm-3.