HD 222109

HD 222109

Observation data Epoch J2000      Equinox J2000
Constellation	Andromeda
Right ascension	23^h 37^m 32.04280^s[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 mas[1]
Distance	approx. 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
Mass	2.9[7] M☉
Surface gravity (log g)	3.932±0.021[8] cgs
Temperature	12,157±100[8] K
Rotational velocity (v sin i)	158±13[8] km/s
Age	54[7] Myr
Other designations
BD+43° 4508, HD 222109, HIP 116582, HR 8962, SAO 53202.
Database references
SIMBAD	data

HD 222109 is a binary star system located in the northern constellation of Andromeda. It has a combined apparent visual magnitude of 5.80,[2] which allows it to be visible to the naked eye as a single star. The system has a combined spectral classification of B8V.[4] It is situated at a distance of approximately 800 light years from the Solar System,[1] and the two stars orbit each other with a period of 351.22 years. They are separated by a distance of 0.41″ and have an orbital eccentricity of 0.39.[3] Individually, the stars have apparent magnitudes of 6.08 and 7.38, respectively.[3]

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, S2CID 18759600
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. S2CID 119231169.
6. "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. 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. S2CID 119179065.
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, S2CID 118532653

External links

• Image HD 222109