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The nature of the supersoft X-ray source RX~J0513--69 | | K.A. Southwell
; M. Livio
; P.A. Charles
; D. O’Donoghue
; W.J. Sutherland
; | | Date: |
15 May 1996 | | Journal: | ApJ 470 (1996) 1065 | | Abstract: | We present spectroscopy and photometry of the LMC supersoft binary system RX~J0513.9-6951. We derive a refined spectroscopic period of P$=0.761pm0.004$~d, which is consistent with the value obtained from long term photometric monitoring (P$=0.76278pm0.00005$~d). We see bipolar outflow components of He{sc ii} and H$eta$, with velocities of $sim 3800$,km,s$^{-1}$, strongly suggesting that the compact object is a white dwarf. Using all the available optical and X-ray data, we construct a theoretical model to explain the principal features of the unusual variability of this source. In particular, we note that X-ray outbursts have only been seen at times of optical minima. From this, we conclude that the most likely cause of the X-ray outbursts is a photospheric contraction during a nuclear shell burning phase, rather than a thermonuclear flash or shocked emission. The system probably comprises a relatively massive white dwarf accreting at a high rate ($sim 10^{-6} M_{odot}~{
m yr}^{-1}$) from an evolved donor star, and is observed close to pole-on. | | Source: | arXiv, astro-ph/9605090 | | Services: | Forum | Review | PDF | Favorites | |
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