Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aca....57..331o&link_type=abstract
Acta Astronomica, v.57, pp. 331-345, (2007).
Other
11
Stars: Individual: Bf Ara, Binaries: Close, Novae, Cataclysmic Variables
Scientific paper
We report CCD photometry of the dwarf nova BF Ara in quiescence carried out throughout fifteen consecutive nights. Light curve in this interval is dominated by a large amplitude (approx 0.8 mag), two period modulations. Higher amplitude signal has a period of 0.082159(4) days, which was increasing at the rate of dot P/P_{sh}=3.8(3)x10^{-5}. Weaker and stable second signal has a period of 0.084176(21) days. Because the superhump period of BF Ara is equal to 0.08797(1) days, the first modulation is interpreted as quiescent negative superhump arising from retrograde precession of titled accretion disk and the latter one as the orbital period of the binary. The respective period excess and defect are epsilon=4.51%+/-0.03% and epsilon_-=-2.44%+/-0.02%. Thus BF Ara is yet another in-the-gap nova with mass ratio of q approx 0.21.
Olech Arkadiusz
Rutkowski Artur
Schwarzenberg-Czerny Aleksander
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