22 Boötis
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]
| 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] |
| 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 |
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 Edit
- ^ a b c d e f g h i j k l 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.
- ^ a b c d e f g h i 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.
- ^ a b 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.
- ^ a b c 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.
- ^ a b c "f Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 9, 2019.
- ^ 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.
- ^ a b 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.
External links Edit
- HR 5405
- Image 22 Boötis