HD 222109

HD 222109 is a binary star system in the northern constellation of Andromeda. They have a combined apparent visual magnitude of 5.80,[2] making them visible by the naked eye as a single star. They also have a combined spectral classification B8V.[4] The pair is located at approximately 800 light years from Solar System,[1] and orbit each other with a period of 351.22 years, a separation of 0.41″, and an orbital eccentricity of 0.39.[3] They have individual apparent magnitudes of 6.08 and 7.38, respectively.[3]

HD 222109
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 37m 32.04280s[1]
Declination +44° 25′ 44.3723″[1]
Apparent magnitude (V) 5.80[2] (6.08 + 7.38)[3]
Characteristics
Spectral type B8V[4]
U−B color index -0.32[2]
B−V color index -0.06[2]
Astrometry
Radial velocity (Rv)−22.90±3.9[5] km/s
Proper motion (μ) RA: 14.20±0.30[1] mas/yr
Dec.: −17.63±0.45[1] mas/yr
Parallax (π)4.04 ± 0.52[1] mas
Distanceapprox. 800 ly
(approx. 250 pc)
Orbit[6]
Period (P)351.22 yr
Semi-major axis (a)0.41″
Eccentricity (e)0.39
Inclination (i)40.3°
Longitude of the node (Ω)157.1°
Periastron epoch (T)B 2103.29
Argument of periastron (ω)
(secondary)		0.0°
Details
Mass2.9[7] M☉
Surface gravity (log g)3.932±0.021[8] cgs
Temperature12,157±100[8] K
Rotational velocity (v sin i)158±13[8] km/s
Age54[7] Myr
Other designations
BD+43° 4508, HD 221776, HIP 116582, HR 8962, SAO 53202.
Database references
SIMBADdata

References
  1. van Leeuwen, F. (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
  2. Guetter, H. H.; Hewitt, A. V. (June 1984), "Photoelectric UBV photometry for 317 PZT and VZT stars", Publications of the Astronomical Society of the Pacific, 96: 441–443, Bibcode:1984PASP...96..441G, doi:10.1086/131362
  3. Malkov, O. Yu.; et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics, 546: 5, Bibcode:2012A&A...546A..69M, doi:10.1051/0004-6361/201219774, A69
  4. Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
  5. Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  6. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 14 March 2017.
  7. Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv:1604.06456. Bibcode:2016AJ....152...40G. doi:10.3847/0004-6256/152/2/40.
  8. Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605


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