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Long-Term Variability in the Quiescent X-Ray Transient V404 CYG

Published online by Cambridge University Press:  22 February 2018

C. Zurita ,
J. Casares ,
P. A. Charles ,
R. I. Hynes ,
E. P. Pavlenko  and
T. Shahbaz
C. Zurita
Affiliation:
CAAUL, Observatório Astronómio de Lisboa, Tapada da Ajuda 1349-018 Lisboa, Portugal (czurita@oal.ul.pt)
J. Casares
Affiliation:
Instituto de Astrofisica de Canarias, Spain
P. A. Charles
Affiliation:
University of Southampton, UK
R. I. Hynes
Affiliation:
University of Texas at Austin, USA
E. P. Pavlenko
Affiliation:
Crimean Astrophysical Observatory, Ukraine
T. Shahbaz
Affiliation:
Instituto de Astrofisica de Canarias, Spain

Extract

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We present the results of optical and infrared photometry of the quiescent X-ray transient V404 Cyg during the period 1992-2003.

It is largely known that the Soft X-ray Transient (SXT) V404 Cyg exhibits short-term (sub-orbital) variations during quiescence (see eg. Pavlenko et al. 1996). It seems that fast variability during quiescence is not a peculiarity of V404 Cyg but a fingerprint of quiescent SXTs, irrespective of the nature of the compact object (Zurita, Casares & Shahbaz, 2003). Although these variations seem to originate in the accretion disc, the underlaying physical mechanism is not yet understood. Since V404 Cyg is the brightest SXT, and hence accessible with 1-m type telescopes, we embarked on a study of the fast variability over the period 1992-2003.

Type
The Contributed Papers
Information
International Astronomical Union Colloquium , Volume 194: Compact binaries in the galaxy and beyond , 2004 , pp. 221
Copyright
Copyright © Instituto de astronomia/revista mexicana de astronomίa y astrofίsica 2004

References

Casares, J., Charles, P. A., Naylor, T., 1992, Natur, 355, 614 Google Scholar
Pavlenko, E. P., Martin, A. C., Casares, J., Charles, P. A., Ketsaris, N. A., 1996, MNRAS, 281, 1094 Google Scholar
Zurita, C., Casares, J. & Shahbaz, T., 2003, ApJ, 582, 369 Google Scholar