期刊
ASTRONOMY REPORTS
卷 54, 期 1, 页码 6-16出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S1063772910010026
关键词
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资金
- State Foundation for Basic Research of Ukraine [F25/139, F28.2/081]
- Russian Foundation for Basic research [09-02-00225, 09-02-90458, 08-02-01220]
- Russian Federation [NSh-1685.2008.2]
- Slovak Academy of Sciences [VEGA-7010]
We analyze photometry of the dwarf nova MN Dra carried out using various instruments at four observatories on 18 nights between May 20 and June 28, 2009. The observations cover a variety of activity states of the system: a superoutburst, three normal outbursts, and quiescence. Analysis of the system's light curve during the superoutburst decline reveals positive superhumps that recur, on average, with a period of 0.105 days and are due to the direct apsidal precession of the accretion disk. These are observed until the end of the superoutburst, but their period decreases at a rate of -24.5 x 10(-5) of the period per period. Both the positive-superhump period and its derivative are in good agreement with estimates made during previous superoutbursts. At the brightness minimum and in normal outbursts, MN Dra displays brightness variations with a period of 0.096 days, whose amplitude is much larger during the brightness minimum (0.8 (m) -1.5 (m) ) than during normal outbursts (0.1 (m) -0.2 (m) ). We suggest that these brightness variations could be negative superhumps due to nodal precession of the oblique accretion disk.
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