X-rays from the Symbiotic Star RX Pup |
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| Authors: | Gerardo J M Luna J L Sokoloski Roberto D D Costa |
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| Institution: | (1) Harvard-Smithsonian Center for Astrophysics, Harvard, USA;(2) Instituto de Astronomia, Geofisica e Ciencias Atmosfericas/USP, Sao Paulo, Brazil |
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| Abstract: | We describe X-ray and optical observations of the symbiotic star RX Pup. From low resolution optical spectra, we obtain a reddening for RX Pup of E(B−V)=0.79. We use the neutral column density corresponding to this reddening as a lower limit for the X-ray spectra fits. The X-ray spectra can be fitted with either a two-temperarure thermal plasma model or a single-temperature plasma plus a narrow line at ≈0.55 keV, each modified by interstellar absorption. The RX Pup X-ray flux is not variable within the observation exposure time, suggesting that unlike in most CVs, an accretion disk boundary layer does not contribute significantly to the X-ray flux. Instead, the X-ray emission may come from shock-heated gas further away from the compact object. |
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| Keywords: | Stars-binaries: Symbiotics X-ray Optical |
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