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Title:
Variability in the cycle length of the supersoft source RX J0513.9-6951
Authors:
Burwitz, V.; Reinsch, K.; Greiner, J.; Meyer-Hofmeister, E.; Meyer, F.; Walter, F. M.; Mennickent, R. E.
Affiliation:
AA(Max-Planck-Institut für extraterrestische Physik, PO Box 1312, 85741 Garching, Germany ), AB(Institut für Astrophysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany), AC(Max-Planck-Institut für extraterrestische Physik, PO Box 1312, 85741 Garching, Germany), AD(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching, Germany), AE(Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85740 Garching, Germany), AF(Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, NY 11794-3800, USA), AG(Departamento de Física, Universidad de Concepción, Casilla 160-C, Concepción, Chile)
Publication:
Astronomy and Astrophysics, Volume 481, Issue 1, 2008, pp.193-198 (A&A Homepage)
Publication Date:
04/2008
Origin:
EDP
Keywords:
stars: individual: RX J0513.9-6951, stars: binaries: close, stars: white dwarfs, accretion, accretion disks, X-rays: stars, galaxies: individual: Large, Magellanic Cloud
DOI:
10.1051/0004-6361:20067010
Bibliographic Code:
2008A&A...481..193B

Abstract

Context: The supersoft X-ray binary RX J0513.9-6951 shows cyclic changes between optical-low / X-ray-on states and optical-high / X-ray-off states. It is supposed to be accreting close to the Eddington-critical limit and driven by “accretion wind evolution”. Aims: We seek to derive the variations in the characteristic time scales of the long-term optical light curve and to determine the implications for the physical parameters of the system. Methods: We used existing and new optical monitoring observations covering a total time span of 14 years and compared the durations of the low and high states with the model calculations of Hachisu & Kato. Results: The cycle lengths and especially the durations of the optical high states show a longterm modulation with variations that, according to the accretion wind evolution model, would imply variations in the mass transfer rate by a factor of 5 on timescales of years.
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