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11 Persei
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Perseus
Right ascension	02h 43m 02.83826s
Declination	+55° 06′ 21.6700″
Apparent magnitude (V)	5.76
Characteristics
Evolutionary stage	main sequence
Spectral type	B7 III(p?) (Hg?)
B−V color index	−0.110±0.003
Astrometry
Radial velocity (Rv)	−0.7±1.0 km/s
Proper motion (μ)	RA: +34.859 mas/yr ; Dec.: −21.955 mas/yr
Parallax (π)	7.8022 ± 0.0874 mas
Distance	418 ± 5 ly ; (128 ± 1 pc)
Absolute magnitude (MV)	0.16
Details
Mass	3.77±0.06 M☉
Radius	3.2 R☉
Luminosity	210.4+21.9; −19.9 L☉
Surface gravity (log g)	4.19 cgs
Temperature	14,550 K
Metallicity [Fe/H]	+0.09 dex
Rotation	25–70 d
Rotational velocity (v sin i)	4.50 km/s
Age	50.9±12.2 Myr
Other designations
	11 Per, BD+54°598, FK5 2188, HD 16727, HIP 12692, HR 785, SAO 23555
Database references
SIMBAD	data

11 Persei is a single^[11]^[8] star in the constellation of Perseus, located about 418 light years away from the Sun. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.76.^[2]

This is a chemically peculiar mercury-manganese star.^[12]^[6] Cowley (1972) found a stellar classification of B7 III(p?) (Hg?),^[4] while Hube (1970) had B8 IV,^[13] and Appenzeller (1967) showed B6 V.^[14] Stellar models indicate this is a young B-type main sequence star^[3] with an estimated age of around 51^[9] million years. It has a low rotation rate, showing a projected rotational velocity of 4.50 km/s.^[8] The star has 3.8^[3] times the mass of the Sun and is radiating 210^[3] times the Sun's luminosity from its photosphere at an effective temperature of 14,550 K.^[6]

References

^ ^a ^b ^c ^d ^e 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 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 ^c ^d ^e ^f Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ ^a ^b Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ ^a ^b ^c ^d ^e Ghazaryan, S.; Alecian, G. (2016), "Statistical analysis from recent abundance determinations in HgMn stars", Monthly Notices of the Royal Astronomical Society, 460 (2): 1912, Bibcode:2016MNRAS.460.1912G, doi:10.1093/mnras/stw911.
^ Wahlgren, Glenn Michael; et al. (January 2012), "Emission Line Variability In The HgMn Star 11 Per", American Astronomical Society, AAS Meeting #219, vol. 219, p. 439.04, Bibcode:2012AAS...21943904W, 439.04.
^ ^a ^b ^c Hubrig, S.; Castelli, F. (September 2001), "New results of magnetic field diagnosis in HgMn stars and normal late B-type stars", Astronomy and Astrophysics, 375 (3): 963–976, Bibcode:2001A&A...375..963H, doi:10.1051/0004-6361:20010894.
^ ^a ^b Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
^ "11 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-28.
^ 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.
^ Adelman, S. J.; Yüce, K. (August 2010), "Elemental abundance analyses with Coudé Echelle spectrograms from the TÜBİTAK National Observatory of Turkey: I. The HgMn stars 11 Per, HR 2801, and ν Cnc", Astronomische Nachrichten, 331 (8): 785–793, Bibcode:2010AN....331..785A, doi:10.1002/asna.201011411.
^ Hube, Douglas P. (1970), "The radial velocities of 335 late B-type stars", Memoirs of the Royal Astronomical Society, 72: 233–280, Bibcode:1970MmRAS..72..233H.
^ Appenzeller, Immo (April 1967), "MK Spectral Types for 185 Bright Stars", Publications of the Astronomical Society of the Pacific, 79 (467): 102, Bibcode:1967PASP...79..102A, doi:10.1086/128449.