Symbiotic stars in X-rays II: faint sources detected with XMM-Newton and Chandra
Abstract
We report the detection, with Chandra and XMM- Newton, of faint, soft X-ray emission from four symbiotics stars that were not known to be X-ray sources. These four object show a β-type X-ray spectrum, i.e. 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.
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