2 Persei

2 Persei
Observation data; Epoch J2000 Equinox J2000
Constellation	Perseus
Right ascension	01h 52m 09.37243s[1]
Declination	+50° 47′ 34.0662″[1]
Apparent magnitude (V)	5.70[2]
Characteristics
Spectral type	B9pHgMn[3]
B−V color index	−0.067±0.004[2]
Astrometry
Radial velocity (Rv)	11.4±0.2[4] km/s
Proper motion (μ)	RA: +17.454[1] mas/yr ; Dec.: −29.871[1] mas/yr
Parallax (π)	6.5107 ± 0.1939[1] mas
Distance	500 ± 10 ly ; (154 ± 5 pc)
Absolute magnitude (MV)	−0.14[2]
Orbit[4]
Primary	2 Persei A
Companion	2 Persei B
Period (P)	5.62698±0.00002 d
Eccentricity (e)	0.024±0.011
Periastron epoch (T)	2440281.3±0.4 JD
Argument of periastron (ω); (primary)	208±24°
Semi-amplitude (K1); (primary)	26.5±0.3 km/s
Details
Luminosity	145.30[2] L☉
Temperature	9,412[1] K
Rotational velocity (v sin i)	25[5] km/s
Other designations
	BD+50°379, FK5 1052, HD 11291, HIP 8714, HR 536, SAO 22696[6]
Database references
SIMBAD	data

2 Persei is a binary star system in the northern constellation Perseus, located around 500 light years away from the Sun. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude is 5.70.[2] The system is moving further away from the Earth with a heliocentric radial velocity of 11 km/s.[4]

In 1970 radial velocity measurements from spectrograms taken at David Dunlap Observatory indicated it was a single-lined spectroscopic binary.[7][5] Follow up observations led to the determination that it had a nearly circular orbit with a period of 5.6 days.[4] The visible component is a chemically peculiar mercury-manganese star with a stellar classification of B9pHgMn.[3] Other analyses of its spectrum have assigned it the giant star spectral type of B9III.[8]

References

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.
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.
Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
Heard, J. F.; Krautter, A. (1975). "The orbit of the spectroscopic binary HD 11291". Journal of the Royal Astronomical Society of Canada. 69: 22–24. Bibcode:1975JRASC..69...22H.
Abt, Helmut A.; et al. (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.
"2 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.
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.
Sato, K.; Kuji, S. (November 1990). "MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington". Astronomy and Astrophysics Supplement Series. 85 (3): 1069–1087. Bibcode:1990A&AS...85.1069S.

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[GaiaDR2-1] 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.

[Anderson2012-2] 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.

[aj74_375-3] Cowley, A.; et al. (April 1969). "A study of the bright A stars. I. A catalogue of spectral classifications". Astronomical Journal. 74: 375–406. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.

[Heard1975-4] Heard, J. F.; Krautter, A. (1975). "The orbit of the spectroscopic binary HD 11291". Journal of the Royal Astronomical Society of Canada. 69: 22–24. Bibcode:1975JRASC..69...22H.

[apj573_1_359-5] Abt, Helmut A.; et al. (July 2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573 (1): 359–365. Bibcode:2002ApJ...573..359A. doi:10.1086/340590.

[Simbad-6] "2 Per". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-19.

[Hube1970-7] 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.

[sato-8] Sato, K.; Kuji, S. (November 1990). "MK classification and photometry of stars used for time and latitude observations at Mizusawa and Washington". Astronomy and Astrophysics Supplement Series. 85 (3): 1069–1087. Bibcode:1990A&AS...85.1069S.