Long-term monitoring confirms binary status for five gamma Cas analogs with periods 59-322 days and ~1 solar mass companions, plus X-ray variability correlated with optical changes in SS397.
Extraordinarily Hot X-ray Emission from the 09 Emission Line Star HD 119682
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abstract
We present new optical and X-ray observations to show that the X-ray source 1 WGA J1346.5--6255 previously associated with the SNR G309.2--0.6 can be unequivocally identified with the emission line star HD 119682 located in the foreground open cluster NGC 5281. Images from Chandra in the X-ray band as well as from Magellan in the narrow optical H-alpha band show a coincidence of the source positions within 0.5". The X-ray source appears extremely hot for an OB-star identified as of O9.7e type. XMM-Newton spectra show plasma temperatures of 1 keV and >8 keV with an X-ray luminosity of 6.2E32 +/-0.1E32 erg/s. The optical and X-ray properties are very reminiscent of the prototype emission line star Gamma-Cas. We discuss the ramifications of this similarity with respect to very early type emission line stars as a new class of hard X-ray sources.
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Long-term investigation of gamma Cas analogs
Long-term monitoring confirms binary status for five gamma Cas analogs with periods 59-322 days and ~1 solar mass companions, plus X-ray variability correlated with optical changes in SS397.