Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996rftu.proc..203w&link_type=abstract
International Conference on X-ray Astronomy and Astrophysics: Röntgenstrahlung from the Universe, p. 203 - 204
Astronomy and Astrophysics
Astrophysics
X-Ray Binaries: Photometry, X-Ray Binaries: Orbital Periods
Scientific paper
The intense galactic X-ray source GX 349+2 (Sco X-2) belongs to the class of persistently bright low-mass X-ray binaries called Z-sources. GX 349+2 has been optically identified with a 19th mag star. Of the six known Z-sources, only two (Sco X-1 and Cyg X-2) have been studied in the optical. It has been suggested that Z-sources as a group are characterized by evolved companions and correspondingly long orbital periods (Sco X-1, P = 0.8 d; Cyg X-2, P = 9.8 d). Southwell et al. (1995) have presented spectroscopic observations of GX 349+2 suggesting a 14 d orbital period. The authors have obtained broadband photometry of the system on six consecutive nights, and find evidence for a 21.7±0.3 h period of 0.14 mag half-amplitude, superposed on erratic flickering typical of Sco X-1 type objects. As with other Z-sources, caution will be needed to insure that the variations are truly periodic, and not simply due to chaotic variability observed over a relatively short time span. If the authors' period is confirmed, then the nature of the 14-d spectroscopic variation found by Southwell et al. is unclear.
Margon Bruce
Wachter Stefanie
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