Astronomy:HD 222109
From HandWiki
Short description: Binary star system in the constellation Andromeda
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| 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 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V
- ↑ 2.0 2.1 2.2 2.3 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, doi:10.1086/131362, Bibcode: 1984PASP...96..441G
- ↑ 3.0 3.1 3.2 Malkov, O. Yu. et al. (2012), "Dynamical Masses of a Selected Sample of Orbital Binaries", Astronomy & Astrophysics 546: 5, doi:10.1051/0004-6361/201219774, A69, Bibcode: 2012A&A...546A..69M
- ↑ 4.0 4.1 Cowley, A. et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, doi:10.1086/110819, Bibcode: 1969AJ.....74..375C
- ↑ 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. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6.
- ↑ 7.0 7.1 Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal 152 (2): 40. doi:10.3847/0004-6256/152/2/40. Bibcode: 2016AJ....152...40G.
- ↑ 8.0 8.1 8.2 Huang, Wenjin et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal 722 (1): 605–619, doi:10.1088/0004-637X/722/1/605, Bibcode: 2010ApJ...722..605H
External links
| Stars |
| ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||
| |||||||||||
| |||||||||||
| Galaxies |
| ||||||||||
| |||||||||||
| |||||||||||
 |  |
