Chandra Observations of a Young Embedded Magnetic B Star in the Rho Ophiuchus Cloud.

摘要

This paper reports the analysis of two Chandra X-ray observations of the young magnetic B star rho Ophiuchus SI. X-ray emission from the star was detected in both observations. The average flux is almost the same in both, but during each observation the flux shows significant time variations by a factor of two on timescales of 20-40 ksec. Each spectrum can be fit by either an absorbed power law model with a photon index of approximately -3 or a thin-thermal plasma model with a temperature of approximately 2 keV and an extremely low metal abundance (less than or equal to 0.1 solar). The spectrum of the first observation has an apparent line feature at about 6.8 keV, which likely corresponds to highly ionized iron K alpha.