AstroSat SXT Observations of Her X-1

摘要

Two observations of the X-ray binary system Her X-1 by the AstroSat Soft X-ray Telescope were carried out in 2017. The first was during Low State and Turn-On, the second was during Main High State without and with dips. During Main High without dips, the power-law continuum, 1 keV emission line complex, and soft blackbody-like emission from Her X-1 are detected. Evidence is found in the spectrum for a highly ionized absorber, consistent with the recently detected corona in Her X-1. The X-ray spectra from different states are compared. The 6.4 keV fluorescent iron line is clearly detected in Low State. The different spectrum components are highly variable between states.