Multiple star system in the constellation Gemini
OU Geminorum (OU Gem) is a visual binary or possible triple star located in the constellation of Gemini .
The system has an absolute magnitude of 5.93, so at a distance of 48 light years it has an apparent magnitude of 6.77 when viewed from earth . It also has a total proper motion of 0.210"/ yr and belongs to the Ursa Major stream.
The system is a much studied BY Draconis variable star with a period of 6.99 days.[ 4] spectral type of K3Vk . The secondary star in the system has a surface temperature of ± 50 K orbits the primary in about seven days.[ 8] [ 9]
References
^ Bopp, B. W.; Noah, P.; Klimke, A.; Hall, D. S.; Henry, G. W. (August 1981). "Photometry of HD 45088 : a new bright BY DRA variable" . Publications of the Astronomical Society of the Pacific . 93 : 504– 506. Bibcode :1981PASP...93..504B . doi :10.1086/130867 S2CID 122130492 . ^ a b c d e Brown, A. G. A.; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics . 595 . A2. arXiv :1609.04172 Bibcode :2016A&A...595A...2G . doi :10.1051/0004-6361/201629512 . hdl :2445/125903 . S2CID 1828208 . Gaia Data Release 1 catalog entry ^ a b c d e Koen, C.; et al. (April 2010). "UBV(RI)C JHK observations of Hipparcos-selected nearby stars" . Monthly Notices of the Royal Astronomical Society 403 (4): 1949– 1968. Bibcode :2010MNRAS.403.1949K . doi :10.1111/j.1365-2966.2009.16182.x ^ a b Bopp, B. W. (1980). "HD 45088 as a BY Draconis variable" . Publications of the Astronomical Society of the Pacific . 92 : 218– 220. Bibcode :1980PASP...92..218B . doi :10.1086/130651 S2CID 119915971 . ^ a b Glazunova, L. V.; et al. (2014). "Absolute parameters and chemical composition of the binary star OU Gem" . Monthly Notices of the Royal Astronomical Society . 444 (2): 1901– 1908. Bibcode :2014MNRAS.444.1901G . doi :10.1093/mnras/stu1576 ^ Fuhrmann, Klaus (2008). "Nearby stars of the Galactic disc and halo - IV" . Monthly Notices of the Royal Astronomical Society . 384 (1): 173– 224. Bibcode :2008MNRAS.384..173F . doi :10.1111/j.1365-2966.2007.12671.x ^ "V* OU Gem" . SIMBAD Centre de données astronomiques de Strasbourg .^ "Aricns 4C00500" . Archived from the original on 2012-09-07. Retrieved 2011-10-04 .^ "Multiwavelength optical observations of chromospherically active bina…" (PDF) . Archived from the original (PDF) on 2012-12-09.
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