Photometry of the Cataclysmic Variables V1159 Ori and BZ UMa

V1159 Ori is an ER UMa sub-type cataclysmic variable belonging to the SU UMa type, and the controversial BZ UMa lies between the U Gem type and the WZ Sge type, but it possesses also the periodicity characteristics of SU UMa. We have made photometric observations of these two cataclysmic variables w...

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Bibliographic Details
Published in:Chinese astronomy and astrophysics 2010-07, Vol.34 (3), p.265-276
Main Authors: Li-lian, Jiang, Fang-zhou, Jiang, Zong-yun, Li, Ying-he, Zhao, Qiu-sheng, Gu
Format: Article
Language:English
Subjects:
Astronomical observatories
Astronomy
Cataclysmic variables
Observers
Outbursts
Photometry
Stars: variables
Telescopes
Uranium
Variable stars
Citations: Items that this one cites
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Summary:V1159 Ori is an ER UMa sub-type cataclysmic variable belonging to the SU UMa type, and the controversial BZ UMa lies between the U Gem type and the WZ Sge type, but it possesses also the periodicity characteristics of SU UMa. We have made photometric observations of these two cataclysmic variables with the 1m RCC optical telescope in Yunnan Astronomical Observatory from Feb. 24th to 25th, 2008. The obtained light curves of V1159 Ori exhibit superhumps in the descending stage of a normal outburst, this provides an observational evidence for the universal existence of superhumps in ER UMa-type stars. During our observations BZ UMa was at the maximum of an outburst, but no evident superhump period was detected. The previous observations made by AAVSO (American Association of Variable Star Observers) also have never found any definite superhump. This demonstrates that BZ UMa probably is not a SU UMa-type variable. According to the range of its magnitude variations, BZ UMa is closer to WZ Sge.
ISSN:0275-1062
1879-128X
DOI:10.1016/j.chinastron.2010.07.005