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Outburst of the unique X-ray transient CI Cam and its impact on the system

Published online by Cambridge University Press:  01 August 2006

V. Šimon ,
C. Bartolini ,
A. Guarnieri ,
A. Piccioni  and
D. Hanžl
V. Šimon
Affiliation:
Astronomical Institute, Academy of Sciences, 25165 Ondřejov, Czech Republic
C. Bartolini
Affiliation:
Dipartimento di Astronomia, Université di Bologna, via Ranzani 1, 40127 Bologna, Italy
A. Guarnieri
Affiliation:
Dipartimento di Astronomia, Université di Bologna, via Ranzani 1, 40127 Bologna, Italy
A. Piccioni
Affiliation:
Dipartimento di Astronomia, Université di Bologna, via Ranzani 1, 40127 Bologna, Italy
D. Hanžl
Affiliation:
N. Copernicus Observatory and Planetarium, Kraví hora 2, 61600 Brno, Czech Republic
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Abstract

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We argue that the outburst of CI Cam (XTE J0421+560), probably containing a black hole, was caused by the thermal instability of the accretion disk. Applying the model of King & Ritter (1998), we obtain a realistic disk mass and radius. The differences from soft X-ray transients belonging to the low-mass X-ray binaries can be explained if the disk in CI Cam heats up an extended envelope and/or a strong jet is formed. We resolve several spectral components in the optical colors in quiescence after the outburst; they vary in a complicated way during a possible 1350 d cycle.

We find indications that the variations of the source of the optical light can be related to those of the X-ray source in quiescence. The accretion disk seems to refill at present. Nowadays, only non-periodic intra-night optical (∼0.02 mag) fluctuations are present. As regards the absence of coherent changes in the optical band, we point out the similarities in the situation of CI Cam and the microquasar LS5039/RX J1826–1450.

Keywords

Accretionaccretion disks – instabilities – stars: variables: other – X-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 447 - 448
Copyright
Copyright © International Astronomical Union 2007

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