12 Boötis

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12 Boötis
Boötes constellation map.svg
Red circle.svg
Location of 12 Boötis (circled)
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[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

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[edit]

  1. ^ a b c d e Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ 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. 
  3. ^ 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
  4. ^ 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:0910.4482Freely accessible. Bibcode:2010ApJ...719.1293K. doi:10.1088/0004-637X/719/2/1293. 
  5. ^ 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. arXiv:astro-ph/9911002Freely accessible. 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:0910.4482Freely accessible. 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[edit]