Optical pulsations in the cataclysmic binary 3A 0729+103

Agrawal, P. C. ; Apparao, K. M. V. ; Singh, K. P. ; Rao, P. V. ; Sarma, M. B. K. (1984) Optical pulsations in the cataclysmic binary 3A 0729+103 Astronomy & Astrophysics, 131 (2). pp. 192-195. ISSN 0004-6361

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Official URL: http://adsabs.harvard.edu/abs/1984A&A...131..192A


Fast photometric observations of the newly discovered cataclysmic variable 3A 0729+103 are reported. Regular optical pulsations, with an average semiamplitude of ~0.15 mag in B-band and having a period in agreement with that reported by McHardy et al. (1982) are clearly detected in the light curve of the star. The optical pulse has a sinusoidal shape. Flares with a maximum amplitude of ~0.43 mag have also been observed. There is also suggestion of flickering on time scales of ≧10s. It is suggested that 3A 0729+103 is similar in characteristics to H 2252-035 class of cataclysmic binaries containing rapidly rotating white dwarfs. Interpretation of the period of optical pulse as the beat period leads to prediction of X-ray pulse period to be about 847s for prograde rotation and 991s for retrograde rotation of the white dwarf compared to the reported ~900-1000s period. Alternative interpretation of the observed optical pulse being due to directly beamed radiation from the vicinity of the pole of the white dwarf is also considered.

Item Type:Article
Source:Copyright of this article belongs to EDP Sciences.
Keywords:X-ray Sources; Catalysmic Variables; X-ray Pulsars
ID Code:59045
Deposited On:03 Sep 2011 12:07
Last Modified:18 May 2016 09:45

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