Volume 565, May 2014
|Number of page(s)||5|
|Section||Stellar structure and evolution|
|Published online||16 May 2014|
Symbiotic stars in X-rays. II. Faint sources detected with XMM-Newton and Chandra
1 Instituto de Ciencias Astronómicas de la Tierra y el Espacio (ICATE-UNSJ), Av. España (sur) 1512, 5400 San Juan, Argentina
2 Instituto de Astronomía y Física del Espacio (IAFE), CC 67 − Suc. 28 (C1428ZAA) CABA, Argentina
3 Osservatorio Astronomico di Palermo (INAF), piazza del Parlamento 1, 90 134 Palermo, Italy
4 CRESST and X-ray Astrophysics Laboratory, NASA/GCFC, Greenbelt MD 20 771, USA. Department of Physics, University of Maryland, Baltimore County, 1000 Hilltop Circle, Baltimore MD 21 250, USA
Received: 6 November 2013
Accepted: 1 March 2014
We report the detection from four symbiotic stars that were not known to be X-ray sources. These four object show a β-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.
Key words: binaries: symbiotic / X-rays: binaries
© ESO, 2014
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