HD 222109
Appearance
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 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 | |
Database references | |
SIMBAD | data |
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]
References
- ^ a b c d e f 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
- ^ a b c d 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
- ^ a b c 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
- ^ a b 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
- ^ 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.
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 14 March 2017.
- ^ a b 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.
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: CS1 maint: unflagged free DOI (link) - ^ a b c 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