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The Supersoft Source RXJ0019.8+2156: New Photoelectric Observations

Published online by Cambridge University Press:  12 April 2016

C. Bartolini ,
A. Guarnieri ,
A. Piccioni  and
L. Solmi
C. Bartolini
Affiliation:
Department of Astronomy, University of Bologna, Via Zamboni 33, 40126 Bologna, Italy, [email protected]
A. Guarnieri
Affiliation:
Department of Astronomy, University of Bologna, Via Zamboni 33, 40126 Bologna, Italy, [email protected]
A. Piccioni
Affiliation:
Department of Astronomy, University of Bologna, Via Zamboni 33, 40126 Bologna, Italy, [email protected]
L. Solmi
Affiliation:
Department of Astronomy, University of Bologna, Via Zamboni 33, 40126 Bologna, Italy, [email protected]

Extract

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RXJ0019.8+2156 is a Supersoft X-ray Source (SSS) discovered by ROSAT and identified (Beuermann et al. 1995) as an object of magnitude V = 12.2, brighter than any other known SSS. The mass function and the optical spectrum are similar to CAL 83, but the X-ray luminosity seems to be lower. The main light variations are: a cyclic modulation with a 15.8 h period and a 0.3 mag amplitude, a quasi-periodic pulsation less than 0.1 mag in 2 h (Beuermann et al. 1995), variations of about 1 mag over a time-scale of 20 yr and small irregular fluctuations on a time-scale of weeks to months (Greiner & Wenzel 1995).

The most promising model, at present, involves a binary system in which a hot 1 M⊙ white dwarf with an accretion disk is accreting at a mean rate of Ṁ ≈ 10−7 M⊙yr−1; sporadic hydrogen burning caused by an unstable mass transfer (Greiner & Wenzel 1995) seems to be present.

Type
Supernovae & Supersoft X-Ray Sources
Information
International Astronomical Union Colloquium , Volume 158: Cataclysmic Variables and Related Objects , 1996 , pp. 427 - 428
Copyright
Copyright © Kluwer 1996

References

Beuermann, K., Reinsch, K., Barwig, H., et al., 1995, A&A, 294, L1 Google Scholar
Greiner, J., Wenzel, W., 1995, A&A, 294, L5 Google Scholar
Piccioni, A., Bartolini, C., Guarnieri, A., Giovannelli, F., 1979, Acta Astronomica, 29, 463 Google Scholar