12 Boötis

12 Boötis is a spectroscopic binary[7] 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 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]
Distance116.8 ± 0.2 ly
(35.82 ± 0.06 pc)
Absolute magnitude (MV)2.00[5]
Orbit[4]
Primary12 Boo Aa
Companion12 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
Mass1.4109±0.0028[4] M☉
Radius2.450[6] R☉
Luminosity7.531 L☉
Surface gravity (log g)3.73[5] cgs
Temperature6115[6] K
Metallicity [Fe/H]−0.065[4] dex
12 Boo Ab
Mass1.3677±0.0028[4] M☉
Radius1.901[6] R☉
Luminosity4.692[6] L☉
Temperature6200[6] K
Metallicity [Fe/H]−0.065[6] dex
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
SIMBADdata

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
  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. S2CID 18759600. 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. S2CID 119253596.
  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. 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.
  7. 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.
  8. 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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