Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..827m&link_type=abstract
Publications of the Astronomical Society of Japan, v.48, p.827-831.
Astronomy and Astrophysics
Astronomy
13
Accretion Disks, Photometry, Stars: Individual (Rxj00198+2156), X-Rays: Binaries
Scientific paper
Photometric observations of the galactic supersoft X-ray source RXJ0019.8+2156 in the B, V, R, and I bands were carried out between July and December of 1995. The observed light curves show periodic variations (Period =15.85hr) with an amplitude of around 0.5mag in all four bands, while color curves (B-V,\ V-R, and V-I) show virtually no variation throughout the cycle. We find a secondary minimum which is highly variable in its shape from one cycle to another. The hump before the secondary minimum (phase ~ 0.3--0.4) is brighter by about 0.1mag compared to that seen after the secondary minimum (phase ~ 0.6--0.7). The primary minimum appears to be stable in depth on a timescale of several months. Furthermore, changes in brightness of about 0.15mag are observed from one cycle to another without detectable variation in the colors. The time scale of these irregular fluctuations is about one week or shorter.
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