Optical Photometry of RX J0019.8+2156 over the Last Three Years
Abstract
We present time resolved UBVRI photometry of RX J0019.8+2156 which we performed with a multi-channel-photometer from 1992 to 1995. The light curves we received show regular and irregular brightness variations. Prominent cyclic depressions of 0.5 mag which cover a phase interval of 0.4 are interpreted as eclipses of a white dwarf by a Roche lobe filling secondary. Furthermore, a shallow minimum at phase 0.5 suggests a secondary eclipse. The orbital period derived from our light, curves shows a little, but systematic difference to the most precise period value given in literature. The varying depth of the primary minimum as another phenomenon may be interpreted either as a cycle to cycle variation or as a quasi-periodic long term modulation.
- Publication:
-
Supersoft X-Ray Sources
- Pub Date:
- 1996
- DOI:
- 10.1007/BFb0102251
- Bibcode:
- 1996LNP...472...99W