32 Boötis

32 Boötis is a single[8] star in the northern constellation of Boötes,[7] located 360 light years away from the Sun.[1] It is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 5.55.[2] This object is moving closer to the Earth with a heliocentric radial velocity of −23 km/s.[2] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.195 arc seconds per annum.[9]

32 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 41m 43.52071s[1]
Declination +11° 39′ 38.3820″[1]
Apparent magnitude (V) 5.55[2]
Characteristics
Spectral type G8 III[3]
B−V color index 0.941±0.002[2]
Astrometry
Radial velocity (Rv)−23.3±0.3[2] km/s
Proper motion (μ) RA: –159.787[1] mas/yr
Dec.: −112.732[1] mas/yr
Parallax (π)9.0120 ± 0.2578[1] mas
Distance360 ± 10 ly
(111 ± 3 pc)
Absolute magnitude (MV)0.09[2]
Details
Mass2.15[4] M☉
Radius12.06+0.09
−0.24[1] R☉
Luminosity79.14±2.57[1] L☉
Surface gravity (log g)2.6±0.3[5] cgs
Temperature4,957.5+50.0
−17.5[1] K
Metallicity [Fe/H]−23.3±0.3[2] dex
Rotational velocity (v sin i)2.6[6] km/s
Age1.46[4] Gyr
Other designations
32 Boo, BD+12°2729, FK5 1382, HD 129336, HIP 71837, HR 5481, SAO 120601, LTT 14344[7]
Database references
SIMBADdata

This is an aging giant star with a stellar classification of G8 III.[3] It is most likely on the horizontal branch and is a candidate red clump giant.[5] The star is an estimated 1.46[4] billion years old with 2.15[4] times the mass of the Sun. With the hydrogen at its core exhausted, it has expanded to 12[1] times the Sun's radius. 32 Boötis is radiating 79[1] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4958 K.[1]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. Harlan, E. A.; Taylor, D. C. (March 1970), "MK classification for F- and G-type stars. II", Astronomical Journal, 75 (2): 165–166, Bibcode:1970AJ.....75..165H, doi:10.1086/110956
  4. Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  5. Afşar, M.; et al. (July 2012), "Chemical Compositions of Thin-disk, High-metallicity Red Horizontal-branch Field Stars", The Astronomical Journal, 144 (1): 20, arXiv:1205.3659, Bibcode:2012AJ....144...20A, doi:10.1088/0004-6256/144/1/20, S2CID 119249237, 20.
  6. De Medeiros, J. R.; et al. (November 2000), "Rotation and lithium in single giant stars", Astronomy and Astrophysics, 363: 239–243, arXiv:astro-ph/0010273, Bibcode:2000A&A...363..239D.
  7. "32 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 10, 2019.
  8. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  9. Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv:astro-ph/0412070, Bibcode:2005AJ....129.1483L, doi:10.1086/427854, S2CID 2603568.
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