22 Boötis

22 Boötis
Observation data; Epoch J2000 Equinox J2000
Constellation	Boötes
Right ascension	14h 26m 27.36529s
Declination	+19° 13′ 36.8470″
Apparent magnitude (V)	5.40
Characteristics
Spectral type	kA7 hA8 mF2 (III) ((Sr II))
B−V color index	0.231±0.006
Astrometry
Radial velocity (Rv)	−27.4±0.5 km/s
Proper motion (μ)	RA: –70.131 mas/yr ; Dec.: +26.084 mas/yr
Parallax (π)	10.2279 ± 0.1491 mas
Distance	319 ± 5 ly ; (98 ± 1 pc)
Absolute magnitude (MV)	0.65
Details
Mass	1.99±0.02 M☉
Radius	4.03+0.23; −0.26 R☉
Luminosity	52.43±0.89 L☉
Surface gravity (log g)	3.13±0.52 cgs
Temperature	7,528+277; −207 K
Metallicity [Fe/H]	+0.36±0.04 dex
Rotational velocity (v sin i)	37.74±2.12 km/s
Other designations
	f Boo, 22 Boo, BD+19°2810, FK5 1378, GC 19480, HD 126661, HIP 70602, HR 5405, SAO 101025
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

^ ^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

[GaiaDR2-1] ^ ^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.

[Anderson2012-2] ^ ^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.

[gray2001-3] 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.

[Adamczak2014-4] 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.

[SIMBAD-5] "f Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 9, 2019.

[Eggleton2008-6] 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.

[Burkhart1980-7] 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.

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22 Boötis

References

External links

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