Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..337s&link_type=abstract
Astrophysical Journal v.419, p.337
Astronomy and Astrophysics
Astronomy
4
Stars: Binaries: General, Stars: Novae, Cataclysmic Variables, Stars: Individual Constellation Name: Kr Aurigae, Stars: Oscillations
Scientific paper
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.
Agrawal Prahlad C.
Apparao Krishna M. V.
Manchanda Ravi K.
Rao Vivekananda P.
Sanwal B. B.
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