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Transient supersoft X-ray emission from V751 Cyg during the optical low-state | | J. Greiner
; G.H. Tovmassian
; R. DiStefano
; A. Prestwich
; R. González-Riestra
; L. Szentasko
; C. Chavarria
; | | Date: |
2 Dec 1998 | | Subject: | astro-ph | | Affiliation: | Astrophys. Inst. Potsdam, Germany), G.H. Tovmassian (UNAM Ensenada, Mexico), R. DiStefano (CfA, USA), A. Prestwich (CfA, USA), R. González-Riestra (LAEFF Madrid, Spain), L. Szentasko (Budapest, Hungary), C. Chavarria(UNAM Ensenada, Mexico | | Abstract: | We have observed V751 Cyg with the ROSAT HRI during its recent optical low state and clearly detect it at a count rate of 0.015 cts/s. The X-ray intensity is a factor of ~20 higher than the upper limit obtained with the ROSAT PSPC during the optical high state. Spectral investigations suggest a very soft X-ray spectrum. We investigate archival IUE data of V751 Cyg and derive a distance of V751 Cyg of d~500 pc based on the extinction estimate of E(B-V)=0.25+-0.05. This implies that the X-ray emission is very luminous, on the order of 10^34-10^36 erg/s. The spectrum during the optical low-state is characterized by a very blue continuum and the presence of strong emission lines of the Balmer series and HeI. Also, HeII 4686 A is clearly detected. We establish that V751 Cyg is a transient supersoft X-ray source and speculate that other VY Scl stars may also be of similar type. | | Source: | arXiv, astro-ph/9812054 | | Services: | Forum | Review | PDF | Favorites | |
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