Astronomy:22 Boötis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 319 ± 5 ly (98 ± 1 pc) |
| Absolute magnitude (MV) | 0.65[2] |
| Details | |
| Mass | 1.99±0.02[4] M☉ |
| Radius | 4.03+0.23 −0.26[1] R☉ |
| Luminosity | 52.43±0.89[1] L☉ |
| Surface gravity (log g) | 3.13±0.52[4] cgs |
| Temperature | 7,528+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 | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 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, doi:10.1086/319956, Bibcode: 2001AJ....121.2148G.
- ↑ 4.0 4.1 4.2 Adamczak, Jens; Lambert, David L. (August 2014), "Carbon and Oxygen Abundances across the Hertzsprung Gap", The Astrophysical Journal 791 (1): 12, doi:10.1088/0004-637X/791/1/58, 58, Bibcode: 2014ApJ...791...58A.
- ↑ 5.0 5.1 5.2 "f Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=f+Boo.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ 7.0 7.1 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.
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