12 Boötis is a spectroscopic binary[7] in the constellation Boötes. It is approximately 122 light years from Earth.[1]
  | |
| 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±0.0000036 d |
| Semi-major axis (a) | 3.4706±0.0055 mas |
| Eccentricity (e) | 0.19214±0.00015 |
| Inclination (i) | 107.95±0.12° |
| Longitude of the node (Ω) | 80.49±0.10° |
| Periastron epoch (T) | 2,454,100.43572±0.00070 |
| Argument of periastron (ω) (secondary) | 286.832±0.029° |
| Semi-amplitude (K1) (primary) | 67.189±0.011 km/s |
| Semi-amplitude (K2) (secondary) | 69.311±0.014 km/s |
| Details | |
| 12 Boo Aa | |
| Mass | 1.4109±0.0028[4] M☉ |
| Radius | 2.450[6] R☉ |
| Luminosity | 7.531 L☉ |
| Surface gravity (log g) | 3.73[5] cgs |
| Temperature | 6115[6] K |
| Metallicity [Fe/H] | −0.065[4] dex |
| 12 Boo Ab | |
| Mass | 1.3677±0.0028[4] M☉ |
| Radius | 1.901[6] R☉ |
| Luminosity | 4.692[6] L☉ |
| Temperature | 6200[6] K |
| Metallicity [Fe/H] | −0.065[6] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
12 Boötis is a yellow-white F-type subgiant with an apparent magnitude of +4.82. It is a spectroscopic binary pair which orbit around its centre of mass once every 9.6045 days,[3] with an estimated separation of 0.0035".[8] The two stars have similar masses around 1.4 M☉, both are slightly hotter than the Sun and about twice as large.[4]
A further 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 edit
- ^ 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. S2CID 18759600. 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 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. S2CID 119253596.
- ^ a b 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
- ^ a b c d e f Ball, Warrick H.; Miglio, Andrea; Chaplin, William J.; Stassun, Keivan G.; García, Rafael; González-Cuesta, Lucia; Mathur, Savita; Appourchaux, Thierry; Benomar, Othman; Buzasi, Derek L.; Jiang (姜晨), Chen; Kayhan, Cenk; Örtel, Sibel; Çelik Orhan, Zeynep; Yıldız, Mutlu; Ong (王加冕), J M Joel; Basu, Sarbani (2022). "Solar-like oscillations and ellipsoidal variations in TESS observations of the binary 12 Boötis". Monthly Notices of the Royal Astronomical Society. 516 (3): 3709–3714. arXiv:2208.02302. Bibcode:2022MNRAS.516.3709B. doi:10.1093/mnras/stac2212.
- ^ 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. S2CID 119253596.
- ^ 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