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CCD Observations of X-Ray Binaries

Published online by Cambridge University Press:  12 April 2016

H. Steinle ,
W. Pietsch ,
M. Gottwald  and
U. Graser
H. Steinle
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Garching, F.R.G.
W. Pietsch
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Garching, F.R.G.
M. Gottwald
Affiliation:
EXOSAT Observatory, ESOC, Darmstadt, F.R.G.
U. Graser
Affiliation:
Max-Planck-Institut für Astronomie, Heidelberg, F.R.G.

Abstract

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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 object mv ≤ 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 (mv = 18) , lasting at least since 1983.

Type
VII. Related Objects
Information
International Astronomical Union Colloquium , Volume 93: Cataclysmic Variables: Recent Multi-Frequency Observations and Theoretical Developments , 1987 , pp. 687
Copyright
Copyright © Reidel 1987