12 Boötis

12 Boötis is a spectroscopic binary[6] in the constellation Boötes. It is approximately 122 light years from Earth.[1]

This article is about d Boötis. It is not to be confused with δ Boötis.

12 Boötis

Location of 12 Boötis (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Boötes
Right ascension	14^h 10^m 23.93342^s[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[4] mas
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
d Boötis, 12 Boötis, FK5 522, GC 19127, HIP 69226, HR 5304, HD 123999, GJ 9470, BD+25°2737, SAO 83203, WDS J14104+2506AB, CCDM 14104+2505
Database references
SIMBAD	data

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

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. Vizier catalog entry
2. 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.
3. 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
4. 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.
5. 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
6. 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.
7. 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

• Image 12 Boötis