Symbiotic stars in X-rays II: faint sources detected with XMM-Newton and   Chandra
  We report the detection, with ${\it Chandra}$ and XMM-${\it Newton}$, of faint, soft X-ray emission from four symbiotics stars that were not known to be X-ray sources. These four object show a $\beta$-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-${\it Newton}$ 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. 
N.E. Nu\~nez, G.J.M. Luna, I. Pillitteri, K. Mukai
astro-ph.SR astro-ph.HE