Quasi-periodic Oscillations in the Cataclysmic Variable KR Aurigae
Abstract
We present fast photometric observations of KR Aurigae, a nova-like variable, made during 1984-1988, in the B and U bands. The light curves show large-amplitude pulsations with periods in the range 480-780 s. The period is found to be different even on consecutive nights and, therefore, these pulsations are interpreted as "quasi-periodic" in nature. The pulsation periods in the bright state are positively correlated with the source intensity, but the low-state periods do not follow this linear trend. We discuss possible explanations of the quasi-periodic oscillations. Pulsations with period in the 1050-1600 s range are also found in the data, which can be attributed to broader features seen in the light curves. We also present the X-ray results from analysis of the observations made with the Einstein Observatory. The X-ray spectrum is found to be soft with a large hydrogen column density.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1993
- DOI:
- 10.1086/173487
- Bibcode:
- 1993ApJ...419..337S
- Keywords:
-
- STARS: BINARIES: GENERAL;
- STARS: NOVAE;
- CATACLYSMIC VARIABLES;
- STARS: INDIVIDUAL CONSTELLATION NAME: KR AURIGAE;
- STARS: OSCILLATIONS