Journal article
A photometry campaign for IR geminorum in quiescence
Chinese journal of astronomy and astrophysics, Vol.4(1), pp.88-96
02/01/2004
DOI: 10.1088/1009-9271/4/1/88
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 similar to 160degrees 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 similar to 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 similar to 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.
Details
- Title: Subtitle
- A photometry campaign for IR geminorum in quiescence
- Creators
- H Fu - Nanjing UniversityZ Y Li - Nanjing UniversityK C Leung - University of Nebraska–LincolnZ S Zhang - National Astronomical ObservatoriesZ L Li - Nanjing UniversityC M Gaskell - University of Nebraska–Lincoln
- Resource Type
- Journal article
- Publication Details
- Chinese journal of astronomy and astrophysics, Vol.4(1), pp.88-96
- DOI
- 10.1088/1009-9271/4/1/88
- ISSN
- 1009-9271
- Publisher
- Science Press
- Number of pages
- 9
- Language
- English
- Date published
- 02/01/2004
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428774502771
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