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Discovery of an X-Ray Off-State in the Supersoft Source CAL 83

Published online by Cambridge University Press:  12 April 2016

P. Kahabka
P. Kahabka*
Affiliation:
Astronomical Institute and Center for High Energy Astrophysics, University of Amsterdam, Kruislaan 403, NL-1098 SJ Amsterdam

Abstract

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An X-ray off state of CAL 83 has been observed in April 1996 with the ROSAT HRI three weeks after a normal on state. An upper limit for a linear decline time of the observed flux of ~20 days (and of an efolding decline time of ~6 days) is deduced. This decline may be due to the response of the white dwarf envelope to a temporary increased mass accretion rate giving rise to an envelope expansion. CAL 83 may resemble the recurrent supersoft LMC transient RX J0513.9–6951 with episodes of disappearance in X-rays.

Type
Part 15. Poster Papers
Information
International Astronomical Union Colloquium , Volume 163: Accretion Phenomena and Related Outflows , 1997 , pp. 730 - 731
Copyright
Copyright © Astronomical Society of the Pacific 1997

References

Brown, T., Cordova, F., Ciardullo, R., et al. 1994, ApJ, 422, 118 Google Scholar
Crampton, D., Hutchings, B., Cowley, A.P., et al., 1996, ApJ 456, 320 Google Scholar
Gänsicke, B.T., Beuermann, K., & de Martino, D. 1996, in: workshop on supersoft sources, ed. Greiner, J., Lecture Notes in Physics, Springer, p.107 Google Scholar
Greiner, J., Hasinger, G., & Kahabka, P. 1991, A&A, 246, L17 Google Scholar
Greiner, J., Bickert, K., Luthardt, R., et al. 1996, UV and X-Ray Monitoring of AG Draconis During the 1994/1995 Outbursts in: workshop on supersoft sources, ed. Greiner, J., Lecture Notes in Physics, Springer, p. 267 Google Scholar
Kahabka, P. 1996a, Transient and fiecurrent Supersoft Sources as Progenitors of Type la Supernovae and Accretion Induced Collapse, in: workshop on supersoft sources, ed. Greiner, J., Lecture Notes in Physics, Springer, p. 215 Google Scholar
Kahabka, P. 1996b, IAU Circ. No. 6432 Google Scholar
Kahbaka, P. 1996c, Discovery of an X-ray off-state in the supersoft source CAL 83, A&AL, (subm.)Google Scholar
Long, K.S., Helfand, D.J., & Grabelsky, D.A. 1981, ApJ, 248, 925 CrossRefGoogle Scholar
Mikolajewska, J., & Kenyon, S.J. 1992, MNRAS, 256, 177 Google Scholar
Southwell, K.A., Livio, M., Charles, P.A., et al. 1996, ApJ, (in press)Google Scholar