CCD Observations of X-Ray Binaries

Details CCD Observations of X-Ray Binaries CCD Observations of X-Ray Binaries

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.131..687s&link_type=abstract

Astrophysics and Space Science, Volume 131, Issue 1-2, pp. 687-687

Astronomy and Astrophysics

Astrophysics

9

Scientific paper

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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