Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...219..158m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 219, no. 1-2, July 1989, p. 158-166.
Astronomy and Astrophysics
Astronomy
10
Stellar Spectrophotometry, Visual Observation, X Ray Astronomy, X Ray Binaries, Abundance, Bremsstrahlung, Brightness Distribution, Charge Coupled Devices, Exosat Satellite, Light Curve
Scientific paper
Partly simultaneous EXOSAT and optical observations of the low-mass X-ray binary 4U 1556-605 are presented. X-ray flux variations of relatively small amplitude (about 20 percent) are accompanied by a significant hardening of the X-ray spectrum. This behavior is investigated in the framework of several currently proposed spectral models. The optical brightness varies by about 0.4 mag on a time scale of hours. However, neither strictly periodic modulation nor strong correlation with X-ray intensity is apparent in the observations. During 28 h of uninterrupted X-ray observations, no X-ray burst was detected. Compared to other low-mass X-ray binaries, 4U 1556-605 shows a low intensity Bowen N III 4634,41-A emission line complex, and a possible relation is suggested between metal abundance and X-ray burst behavior in low-mass X-ray binaries.
Beuermann Klaus
Motch Ch.
Mouchet Martine
Pakull Manfred W.
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