Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..971w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 971-975.
Astronomy and Astrophysics
Astronomy
13
Astronomical Photometry, Infrared Astronomy, Near Infrared Radiation, X Ray Binaries, Cygnus Constellation, Infrared Sources (Astronomy), Light Curve, Periodic Variations, Stellar Magnitude
Scientific paper
The first photometric observations capable of resolving the 4.8-hr period at near-infrared wavelengths of the extraordinary X-ray source Cygnus X-3 have been obtained using a CCD at the Perkins 1.8-m telescope. The data show that the 4.8-hr light curve at I band exhibits a variety of forms ranging from being relatively quiescent within the photometric errors to showing fluctuations exceeding 1 mag on time scales of tens of minutes to several hours. There is a suggestion that the variations may be correlated with phase of the 4.8-hr infrared and X-ray period, but the pulsed fraction of the I band fluctuations is about 90 percent compared to 10-25 percent for the infrared and X-ray variations. If confirmed, these vairations may represent important new information concerning the origin of the 4.8-hr cycle and of the nature of the binary system. The mean I-magnitude of Cygnus X-3 is found to be 20.0 + or - 0.2.
Bus Schelte J.
Kreidl Tobias J.
Wagner Robert Marcus
Williams Wayne
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