X-ray detection of the symbiotic star AG Draconis
نویسندگان
چکیده
منابع مشابه
The UV/X-ray emission of the symbiotic star AG Draconis during quiescence and the 1994/1995 outbursts
We present the results of an extensive campaign of coordinated X-ray (ROSAT) and UV (IUE) observations of the symbiotic star AG Dra during a long period of quiescence followed recently by a remarkable phase of activity characterized by two optical outbursts. Themajor optical outburst in June 1994 and the secondary outburst in July 1995 were covered by a number of target of opportunity observati...
متن کاملIUE observations of the high-velocity symbiotic star AG Draconis III. A compendium of 17 years of UV monitoring, and comparison with optical and X-ray observations
We present the first extensive analysis of the ultraviolet observations with the IUE mission of the high velocity symbiotic system AG Draconis, covering the period June 1979– February 1996 which included three active phases of the system with six light maxima. The low resolution IUE line and continuum fluxes are compared with optical observations and with archival X-ray data. The analysis of th...
متن کاملX - ray observations of 4 Draconis : symbiotic binary or cataclysmic triple ?
We present the first X-ray observations of the 4 Draconis system, consisting of an M3 III giant with a hot ultraviolet companion. It has been claimed that the companion is itself an AM Her-type binary system, an identification that places strong constraints on the evolution of cataclysmic variables. We find that the X-ray properties of 4 Draconis are consistent with the presence of an accreting...
متن کاملAnalysis of the U-band orbital variation of the symbiotic binary AG Draconis during quiescence
The photometric U orbital variations of the symbiotic binary AG Dra, caused by occultation of a bright gaseous region by the K giant in this system, are used to derive the emission from the circumbinary nebula, that is supposed to be generated by the cool giant’s wind. Assuming spherical symmetry and constant expansion velocity for the wind, and that the giant has the same intrinsic continuum e...
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ژورنال
عنوان ژورنال: International Astronomical Union Colloquium
سال: 1982
ISSN: 0252-9211
DOI: 10.1017/s0252921100097499