OU Geminorum

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OU Geminorum
OUGemLightCurve.png
A visual band light curve for OU Geminorum, adapted from Bopp et al. (1981) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Gemini
Right ascension 06h 26m 10.2464s [2]
Declination +18° 45′ 24.896″ [2]
Apparent magnitude  (V)6.768 [3]
Characteristics
Spectral type K3Vk [3]
U−B color index 0.662 [3]
B−V color index 0.972 [3]
Variable type BY Dra [4]
Astrometry
Radial velocity (Rv)−8.98±0.10 [5] km/s
Proper motion (μ)RA: −124.020±0.097 [2] mas/yr
Dec.: −159.335±0.054 [2] mas/yr
Parallax (π)68.46±0.34  mas [2]
Distance 47.6 ± 0.2  ly
(14.61 ± 0.07  pc)
Absolute magnitude  (MV)5.93±0.05 [3]
Orbit [5]
PrimaryOU Gem Aa
CompanionOU Gem Ab
Period (P)6.991878±0.000004 d
Eccentricity (e)0.151±0.0024
Periastron epoch (T)54900.0719±0.0203  JD
Argument of periastron (ω)
(secondary)		77.63±1.09°
Semi-amplitude (K1)
(primary)		57.09±0.15 km/s
Semi-amplitude (K2)
(secondary)		66.22±0.28 km/s
Details [6]
OU Gem Aa
Mass 0.85  M☉
Radius 0.81  R☉
Surface gravity (log g)4.55  cgs
Temperature 4960  K
OU Gem Ab
Mass 0.71  M☉
Radius 0.65  R☉
Surface gravity (log g)4.65  cgs
Temperature 4390  K
Other designations
OU Gem, BD+18 1214, GJ 233, HD  45088, HIP  30630, SAO  95677 [7]
Database references
SIMBAD data

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] The primary star has a spectral type of K3Vk. 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. ↑ 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.
  2. 1 2 3 4 5 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
  3. 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 .
  4. 1 2 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.
  5. 1 2 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 .
  6. ↑ 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 .
  7. ↑ "V* OU Gem". SIMBAD . Centre de données astronomiques de Strasbourg.
  8. ↑ "Aricns 4C00500". Archived from the original on 2012-09-07. Retrieved 2011-10-04.
  9. ↑ "Multiwavelength optical observations of chromospherically active bina…" (PDF). Archived from the original (PDF) on 2012-12-09.
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