First unambiguous X-ray detection of R Aquarii

Citations Over TimeTop 10% of 1987 papers

Abstract

The authors report coordinated ultraviolet and X-ray observations of the symbiotic Mira R Aqr obtained with IUE and EXOSAT in 1985 June and December at phases 0.0 and 0.5 of the Mira light curve. They have detected with the Low-Energy EXOSAT detector a weak X-ray flux of 5.4 and 4.6×10-3 counts s-1 at the two epochs, respectively. The source is probably soft, with a 0.2 - 1 keV luminosity of 0.8 - 1.0×1030erg s-1. An IUE image of the jet obtained in 1985 December shows high-temperature lines of N V and He II stronger than in an exposure of the star. It is argued that the X-rays are mostly emitted from the jet. Possible radiation mechanisms of the X-ray source in R Aqr are considered.

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