Symbiotic Stars in X-rays. II. Faint Sources Detected with XMM-Newton and Chandra.

摘要

We report the detection from four symbiotic stars that were not known to be X-ray sources. These four object show a ?-type X-ray spectrum, that is, their spectra can be modeled with an absorbed optically thin thermal emission with temperatures of a few million degrees. Photometric series obtained with the Optical Monitor on board XMM-Newton from V2416 Sgr and NSV 25735 support the proposed scenario where the X-ray emission is produced in a shock-heated region inside the symbiotic nebulae.