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22 Boötis is a single[6] star in the northern constellation of Boötes,[5] located 319 light years away from the Sun.[1] It has the Bayer designation f Boötis; 22 Boötis is the Flamsteed designation.[5] This object is visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 5.40.[2] It is moving closer to the Earth with a heliocentric radial velocity of −27 km/s.[2]

22 Boötis
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 26m 27.36529s[1]
Declination +19° 13′ 36.8470″[1]
Apparent magnitude (V) 5.40[2]
Characteristics
Spectral type kA7 hA8 mF2 (III) ((Sr II))[3]
B−V color index 0.231±0.006[2]
Astrometry
Radial velocity (Rv)−27.4±0.5[2] km/s
Proper motion (μ) RA: –70.131[1] mas/yr
Dec.: +26.084[1] mas/yr
Parallax (π)10.2279 ± 0.1491 mas[1]
Distance319 ± 5 ly
(98 ± 1 pc)
Absolute magnitude (MV)0.65[2]
Details
Mass1.99±0.02[4] M☉
Radius4.03+0.23
−0.26[1] R☉
Luminosity52.43±0.89[1] L☉
Surface gravity (log g)3.13±0.52[4] cgs
Temperature7,528+277
−207[1] K
Metallicity [Fe/H]+0.36±0.04[2] dex
Rotational velocity (v sin i)37.74±2.12[2] km/s
Other designations
f Boo, 22 Boo, BD+19°2810, FK5 1378, GC 19480, HD 126661, HIP 70602, HR 5405, SAO 101025[5]
Database references
SIMBADdata

This is an Am star[7] with a stellar classification of kA7 hA8 mF2 (III) ((Sr II)),[3] showing the calcium K line of an A7 star, the hydrogen lines of an A8 star, and the metal lines of an F2 star. It has the luminosity class of a giant star and does not appear to be variable.[7] The star has twice[4] the mass of the Sun and four[1] times the Sun's radius. It is spinning with a projected rotational velocity of 38[2] km/s. 22 Boötis is radiating 52[1] times the Sun's luminosity from its photosphere at an effective temperature of 7,528 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. Gray, R. O.; et al. (2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
  4. Adamczak, Jens; Lambert, David L. (August 2014), "Carbon and Oxygen Abundances across the Hertzsprung Gap", The Astrophysical Journal, 791 (1): 12, arXiv:1407.2157, Bibcode:2014ApJ...791...58A, doi:10.1088/0004-637X/791/1/58, S2CID 119104634, 58.
  5. "f Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 9, 2019.
  6. 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.
  7. Burkhart, C.; et al. (December 1980), "The atmospheric abundances of the giant AM star 22 Bootis", Astronomy and Astrophysics, 92 (1–2): 132–138, Bibcode:1980A&A....92..132B.



На других языках

- [en] 22 Boötis

[ru] 22 Волопаса

22 Волопаса (лат. 22 Boötis), f Волопаса (лат. f Boötis), HD 126661 — двойная звезда в созвездии Волопаса на расстоянии приблизительно 319 световых лет (около 97,8 парсеков) от Солнца. Видимая звёздная величина звезды — +5,394m[2].


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