X射线中的共生星II：用XMM-牛顿和钱德拉探测到的微弱源
Symbiotic stars in X-rays II: faint sources detected with XMM-Newton and Chandra
摘要：
我们报告的检测，与${\it Chandra}$和XMM- ${\it Newton}$，微弱的，软X射线发射的四个共生星，不知道是X射线源。这四个物体显示了$β$型X射线光谱，即它们的光谱可以用吸收的光学薄热发射来建模，温度为几百万度。利用V2416 Sgr和NSV 25735的XMM- ${\it Newton}$上的光学监测器获得的光度系列支持提出的设想，即X射线发射是在共生星云内的激波加热区域产生的。
英文摘要：
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 $β$-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-${\it Newton}$ 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.
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