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Title:
Near-infrared CCD photometry of Cygnus X-3
Authors:
Wagner, R. Mark; Kreidl, T. J.; Bus, S. J.; Williams, Wayne
Affiliation:
AA(Ohio State University, Columbus), AB(Lowell Observatory, Flagstaff, AZ), AC(Lowell Observatory, Flagstaff, AZ), AD(Lowell Observatory, Flagstaff, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 15, 1989, p. 971-975. (ApJ Homepage)
Publication Date:
11/1989
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Photometry, Infrared Astronomy, Near Infrared Radiation, X Ray Binaries, Cygnus Constellation, Infrared Sources (Astronomy), Light Curve, Periodic Variations, Stellar Magnitude
DOI:
10.1086/168078
Bibliographic Code:
1989ApJ...346..971W

Abstract

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.

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