Query : 2000A&A...354L..37R

2000A&A...354L..37R - Astronomy and Astrophysics, volume 354, L37-40 (2000/2-1)

A limit-cycle model for the binary supersoft X-ray source RX J0513.9-6951.


Abstract (from CDS):

We present new results of our X-ray monitoring of the transient binary supersoft X-ray source RX J0513.9-6951 in the LMC and of our re-analysis of optical light curves obtained during the MACHO project. We have covered a complete X-ray outburst cycle with the ROSAT HRI detector. From the amplitude and timescale of the soft X-ray variability, tight limits are derived for the temporal behaviour of the white-dwarf radius and the effective temperature of its envelope. A limit-cycle model is proposed to explain the observed optical and X-ray variability, the characteristic timescales of the durations of the X-ray on and off states, and those of the transitions between both states. Our observations confirm that the radius changes of the white-dwarf envelope occur on the Kelvin-Helmholtz timescale. The duration of the X-ray on and off states is compatible with the viscous timescales of the inner and outer accretion disk, respectively.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - stars: binaries: close - stars: binaries: spectroscopic - stars: individual: RX J0513.9-6951 - stars: novae, cataclysmic variables - X-rays: stars

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 SV* HV 5682 XB* 05 13 50.809 -69 51 47.30     16.566 16.606 16.62 ~ 307 0
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15985 1
3 2E 1550 XB* 05 43 34.1600044704 -68 22 22.191505716   15.9   17.2 16.54 ~ 309 0

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