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Title:
A Photometry Campaign for IR Geminorum in Quiescence
Authors:
Fu, Hai; Li, Zong-Yun; Leung, Kam-Ching; Zhang, Zhou-Sheng; Li, Zi-Li; Gaskell, C. Martin
Affiliation:
AA(Department of Astronomy, Nanjing University, Nanjing 210093 ), AB(Department of Astronomy, Nanjing University, Nanjing 210093), AC(Department of Physics and Astronomy, University of Nebraska, Lincoln NE 68588-0111, USA), AD(Yunnan Observatory, Kunming 650011), AE(Yunnan Observatory, Kunming 650011), AF(Department of Physics and Astronomy, University of Nebraska, Lincoln NE 68588-0111, USA)
Publication:
Chinese Journal of Astronomy & Astrophysics, Vol. 4, p. 88-96.
Publication Date:
02/2004
Origin:
CHJAA
Keywords:
accretion, accretion disks, binaries: close, novae, cataclysmic variables, stars: dwarf nova, stars: individual (IR Geminorum)
Bibliographic Code:
2004ChJAA...4...88F

Abstract

We report a V band photometry of the SU UMa star IR Gem at quiescence in January 2002. The observations were made with two telescopes spaced ˜ 160o apart in longitude. Several photometric modulations have been found. One gives a period of 98.50(13) min, exactly equal to the orbital period determined spectroscopically. Two others occasionally strengthen and seem to be positive and negative superhumps with periods of 103.6(4) and 95.4(4) min, 5.2% longer and 3.1% shorter than the orbital period, respectively. A signal at ˜0.6 c/d in the power spectrum is roughly consistent with the expected period of nodal precession of the disk. There is a puzzling peak at 0.21(3) c/d corresponding to the ˜ 4.3 d sine wave seen in the raw light curve. We suspect it to be a beat frequency between the frequencies of apsidal and nodal precessions of the disk. Quasi-periodic cycles with amplitudes 0.15-0.6 mag can be seen in the light curve. The mechanism underlying this modulation is not clear.

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