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CCD observations of X-ray binaries

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Abstract

During two observation periods in 1984 and 1985 we monitored the faint optical counterparts of seven X-ray binaries with a CCD camera attached to the Cassegrain-focus of the 2.2 m telescope at Calar Alto, Spain. The observation periods were 1984, September 25–27, and 1985, August 8–15.

The transient sources 4U0042+32 and 4U0115+63 showed no active state.

The search for an optical candidate of 4U0142+62 did not reveal any objectm v ≤24 within the EXOSAT error box.

Within the EXOSAT error box of EXO2030+37 the reddest object was found to be very faint in blue in contrast to the blue Palomar plate.

The analysis of the other three observed sources 4U1837+04, 1H1929+509, and 4U2129+47 is not yet finalized, but no unexpected bright or faint state of the sources has been found, 4U2129+47 is still in its present low state (m v =18), lasting at least since 1983.

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Authors and Affiliations

  1. Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany

    H. Steinle & W. Pietsch

  2. EXOSAT Observatory, ESOC, Darmstadt, Germany

    M. Gottwald

  3. Max-Planck-Institut für Astronomie, Heidelberg, Germany

    U. Graser

Authors
  1. H. Steinle
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  2. W. Pietsch
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  3. M. Gottwald
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  4. U. Graser
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Steinle, H., Pietsch, W., Gottwald, M. et al. CCD observations of X-ray binaries. Astrophys Space Sci 131, 687 (1987). https://doi.org/10.1007/BF00668158

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  • DOI: https://doi.org/10.1007/BF00668158

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