50 Camelopardalis

50 Camelopardalis is a double star[10] in the northern constellation of Lynx. This object is visible to the naked eye as a faint white star with an apparent visual magnitude of 5.4. It is 430 light years away and moving further from the Earth with a heliocentric radial velocity of 20 km/s.

50 Camelopardalis
Location of 50 Camelopardalis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx
Right ascension 07h 44m 04.1780s[1]
Declination +50° 26′ 01.658″[1]
Apparent magnitude (V) 5.36 + 8.40[2]
Characteristics
Spectral type A0IIIn[3] or B9Vn[4]
U−B color index 0.00[5]
B−V color index 0.00[5]
Astrometry
Radial velocity (Rv)+19.75±8.64[1] km/s
Proper motion (μ) RA: −5.434[1] mas/yr
Dec.: −26,351[1] mas/yr
Parallax (π)7.5728 ± 0.3503 mas[1]
Distance430 ± 20 ly
(132 ± 6 pc)
Absolute magnitude (MV)−1.39[6]
Details
A
Mass3.1[1] M☉
Radius5.4[1] R☉
Luminosity153[1] L☉
Surface gravity (log g)3.40[1] cgs
Temperature9,974[1] K
Metallicity [Fe/H]−0.01[7] dex
Rotational velocity (v sin i)202[8] km/s
Age298[1] Myr
Other designations
50 Cam, BD+50°1460, HD 61931, HIP 37701, HR 2969[9]
Database references
SIMBADdata

50 Camelopardalis has a spectral classification of A0 or B9 and a luminosity class of V or III. The stellar spectrum is noted to have unusually nebulous absorption lines due to its rapid rotation. At an age of 300 million years, the star is modelled to be in the late stages of the main sequence. It has expanded to over five times the radius of the Sun and is radiating 153 times the luminosity of the Sun from its photosphere at an effective temperature of 9,974 K.[1]

Double star catalogues list an 8th-magnitude companion at a separation of 1″. Due to its closeness to the much brighter star, little is known about the companion.[10] The Tycho double star catalogue gives a proper motion similar to the bright primary star.[2]

References
  1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. Fabricius, C.; Høg, E.; Makarov, V.V.; Mason, B.D.; Wycoff, G.L.; Urban, S.E. (March 2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  3. Gray, R. O; Garrison, R. F (1987). "The early a type stars - Refined MK classification, confrontation with Stroemgren photometry, and the effects of rotation". Astrophysical Journal Supplement Series. 65: 581. Bibcode:1987ApJS...65..581G. doi:10.1086/191237.
  4. Abt, H. A.; Morrell, N. A. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  5. Hoffleit, Dorrit; Jaschek, Carlos (1991). "The Bright star catalogue". New Haven. Bibcode:1991bsc..book.....H.
  6. 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.
  7. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778.
  8. Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G.
  9. "50 Camelopardalis". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2022-12-20.
  10. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
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