OU Geminorum
| Observation data Epoch 2000 Equinox 2000 | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 26m 10.25040s[1] |
| Declination | +18° 45′ 24.8597″[1] |
| Apparent magnitude (V) | 6.768[2] |
| Characteristics | |
| Spectral type | K3Vk[2] |
| U−B color index | 0.662[2] |
| B−V color index | 0.972[2] |
| Variable type | BY Dra |
| Astrometry | |
| Radial velocity (Rv) | −8.6[3] km/s |
| Proper motion (μ) | RA: −117.60[1] mas/yr Dec.: −163.48[1] mas/yr |
| Parallax (π) | 67.89 ± 1.53[1] mas |
| Distance | 48 ± 1 ly (14.7 ± 0.3 pc) |
| Absolute magnitude (MV) | 5.93±0.05[2] |
| Details | |
| Surface gravity (log g) | 4.30[4] cgs |
| Temperature | 4,959[4] K |
| Metallicity [Fe/H] | −0.21[4] dex |
| Rotational velocity (v sin i) | 9.90[4] km/s |
| Other designations | |
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[6][7] The primary star is a K3Vk class star.
The secondary star in the system has a surface temperature of 4486±50 K and orbits the primary in about seven days.[8][9]
References
- 1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. - 1 2 3 4 5 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.
- ↑ Nordström, B.; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013.
- 1 2 3 4 Mishenina, T. V.; et al. (November 2012), "Activity and the Li abundances in the FGK dwarfs", Astronomy & Astrophysics, 547: 8, arXiv:1210.6843, Bibcode:2012A&A...547A.106M, doi:10.1051/0004-6361/201118412, A106.
- ↑ "HD 45088 -- Variable of BY Dra type", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2015-04-17.
- ↑ http://www.ucm.es/info/Astrof/users/dmg/papers/pwIII/node10.html
- ↑ http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?bibcode=1980PASP...92..218B&db_key=AST&page_ind=0&data_type=GIF&type=SCREEN_VIEW&classic=YES
- ↑ http://www.ari.uni-heidelberg.de/datenbanken/aricns/cnspages/4c00500.htm
- ↑ http://archive.is/20121209190058/http://cdsweb.cern.ch/record/411408/files/9912160.pdf
External links
Bopp, Bernard (April 1980). "HD 45088 As a BY Draconis Variable". Publication of the Astronomical Society of the Pacific. 92: 218. Bibcode:1980PASP...92..218B. doi:10.1086/130651. Retrieved 3 October 2011.
Luck, R. Earle. "stars within 15 parsecs: abundances for a northern sample - The astronomical journal, 129:1063-1083, 2005 February". Retrieved 3 October 2011.
Innes, T.V.; et al. "OU Gem and AT Cap IN 1984/5 (Commissions 27 and 42 of the IAU)". Information Bulletin on Variable Stars (number 4569). Bibcode:1998IBVS.4569....1I. Retrieved 3 October 2011.
Mishenina T.V. et al. The New Absolute Parameters Of Ou Gem – The star Of By Dra Type Odessa Astronomical Publications, vol. 23 (2010)
University of Hamburg, The. "NEXXUS - Search the Gliese Catalogue". Retrieved 3 October 2011.