12 Boötis
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 10m 23.93342s[1] |
| Declination | 25° 05′ 30.0394″[1] |
| Apparent magnitude (V) | 4.83[2] |
| Characteristics | |
| Spectral type | F9IVw[3] |
| U−B color index | +0.07[2] |
| B−V color index | +0.54[2] |
| Astrometry | |
| Radial velocity (Rv) | +9.646 ± 0.013[4] km/s |
| Proper motion (μ) | RA: -23.43[1] mas/yr Dec.: -59.79[1] mas/yr |
| Parallax (π) | 27.917 ± 0.044 mas[4] |
| Distance | 116.8 ± 0.2 ly (35.82 ± 0.06 pc) |
| Absolute magnitude (MV) | 2.00[5] |
| Orbit[4] | |
| Primary | 12 Boo Aa |
| Companion | 12 Boo Ab |
| Period (P) | 9.6045601(36) d |
| Semi-major axis (a) | 3.4706(55) mas |
| Eccentricity (e) | 0.19214(15) |
| Inclination (i) | 107.95(12)° |
| Longitude of the node (Ω) | 80.49(10)° |
| Periastron epoch (T) | 2454100.43572(70) |
| Argument of periastron (ω) (secondary) | 286.832(29)° |
| Semi-amplitude (K1) (primary) | 67.189(11) km/s |
| Semi-amplitude (K2) (secondary) | 69.311(14) km/s |
| Details | |
| 12 Boo Aa | |
| Mass | 1.4109 ± 0.0028[4] M☉ |
| Radius | 2.9[5] R☉ |
| Surface gravity (log g) | 3.73[5] cgs |
| Temperature | 6130[4] K |
| Metallicity [Fe/H] | 0.0[4] dex |
| 12 Boo Ab | |
| Mass | 1.3677 ± 0.0028[4] M☉ |
| Temperature | 6230[4] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
12 Boötis is a spectroscopic binary[6] in the constellation Boötes. It is approximately 122 light years from Earth.[1]
The primary component, 12 Boötis A, is a yellow-white F-type subgiant with an apparent magnitude of +4.82. The spectroscopic binary pair completes one orbit around its centre of mass once every 9.6045 days,[3] with an estimated separation of 0.0035".[7] A companion, 12 Boötis B, was reported with a separation of approximately one arcsecond in 1989, but subsequent surveys have repeatedly failed to detect this companion.[3]
References
- ^ a b c d e 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. Vizier catalog entry
- ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ a b c Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
- ^ a b c d e f g h Konacki, M. (2010). "High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027". The Astrophysical Journal. 719 (2): 1293–1314. arXiv:0910.4482. Bibcode:2010ApJ...719.1293K. doi:10.1088/0004-637X/719/2/1293.
- ^ a b c Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A. Vizier catalog entry
- ^ Konacki, Maciej; et al. (2010). "High-precision Orbital and Physical Parameters of Double-lined Spectroscopic Binary Stars—HD78418, HD123999, HD160922, HD200077, and HD210027". The Astrophysical Journal. 719 (2): 1293–1314. arXiv:0910.4482. Bibcode:2010ApJ...719.1293K. doi:10.1088/0004-637X/719/2/1293.
- ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774. Vizier catalog entry
See also
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