BN Camelopardalis
{{Short description|Star in the constellation Camelopardalis}}
{{Starbox begin}}
{{Starbox image
| image = 250px
| caption = A visual band light curve for BN Camelopardalis, adapted from Adelman (1997)
}}
{{Starbox observe
| epoch = J2000
| constell = Camelopardalis
| dec = {{DEC|+73|56|48.03820}}
| appmag_v = 5.49 {{nowrap|(5.34 to 5.58)}}
}}
{{Starbox character
| type =
| u-b =
| variable = α2 CVn
}}
{{Starbox astrometry
| parallax = 10.5286
| p_error = 0.2275
}}
{{Starbox detail
| source =
| metal_fe =
| age_myr =
}}
{{Starbox catalog
| names = {{odlist | V=BN Cam | BD=+73°274 | FK5=2387 | HD=32650 | HIP=24254 | HR=1643 | SAO=5455 }}
}}
{{Starbox reference
| Simbad = BN+Cam
}}
{{Starbox end}}
BN Camelopardalis is a suspected astrometric binary in the northern circumpolar constellation of Camelopardalis. It appears as a variable star that is visible to the naked eye as a dim, white-hued point of light with an apparent visual magnitude that fluctuates around 5.49. The system is located at a distance of around 310 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +9 km/s.
The visible component is a weakly magnetic chemically peculiar star with a stellar classification of B9.5VpSi, matching a B-type main-sequence star with an anomalous abundance of silicon.
John Ernest Winzer announced that the star is a variable star, in 1974. It was given its variable star designation in 1981. It ranges in brightness from 5.34 down to 5.58. Samus et al. (2017) have it categorized as an α2 Canum Venaticorum variable with a period of 2.7347 days, while Adelman and Sutton (2007) found a period of 2.73501 days. The star has three times the mass and radius of the Sun and is radiating 110 times the Sun's luminosity from its photosphere at an effective temperature of 11,561 K.
References
{{reflist|refs=
{{cite simbad | title=BN Cam | access-date=2019-08-14 }}
{{cite DR2|502574262409317504}}
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| bibcode=2008MNRAS.389..869E | arxiv=0806.2878
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| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015 | s2cid=119257644
}}
| title=General catalogue of variable stars: Version GCVS 5.1
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| doi=10.1134/S1063772917010085 | bibcode=2017ARep...61...80S | s2cid=125853869 }}
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| volume=99 | pages=135 | year=1995 | postscript=.
| doi=10.1086/192182 | bibcode=1995ApJS...99..135A | doi-access=free }}
| last1=North | first1=P. | postscript=.
| title=Do SI stars undergo any rotational braking?
| journal=Astronomy and Astrophysics
| volume=334 | pages=181–187 | date=June 1998
| bibcode=1998A&A...334..181N | arxiv=astro-ph/9802286 }}
| last1=Renson | first1=P. | last2=Manfroid | first2=J.
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| volume=498 | issue=3 | pages=961–966 | date=May 2009
| doi=10.1051/0004-6361/200810788 | bibcode=2009A&A...498..961R| doi-access=free }}
| title=FCAPT uvby Photometry of the mCP Stars BN Cam, EP Vir, FF Vir, and HD 184905
| last1=Adelman | first1=Saul J. | last2=Sutton | first2=Jason M.
| journal=The Publications of the Astronomical Society of the Pacific
| volume=119 | issue=857 | pages=733–741 | date=July 2007
| doi=10.1086/520627 | bibcode=2007PASP..119..733A | doi-access=free }}
| title=Weak magnetic fields in Ap/Bp stars. Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy
| display-authors=1 | last1=Aurière | first1=M.
| last2=Wade | first2=G. A. | last3=Silvester | first3=J.
| last4=Lignières | first4=F. | last5=Bagnulo | first5=S.
| last6=Bale | first6=K. | last7=Dintrans | first7=B.
| last8=Donati | first8=J. F. | last9=Folsom | first9=C. P.
| last10=Gruberbauer | first10=M. | last11=Hui Bon Hoa | first11=A.
| last12=Jeffers | first12=S. | last13=Johnson | first13=N.
| last14=Landstreet | first14=J. D. | last15=Lèbre | first15=A.
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| journal=Astronomy and Astrophysics
| volume=475 | issue=3 | pages=1053–1065 | date=December 2007
| arxiv=0710.1554 | bibcode=2007A&A...475.1053A
| doi=10.1051/0004-6361:20078189 | s2cid=54850596 | postscript=. }}
| display-authors=1 | last1=Royer | first1=F.
| last2=Grenier | first2=S. | last3=Baylac | first3=M.-O.
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| title=Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i
| journal=Astronomy and Astrophysics
| volume=393 | issue=3 | pages=897–911 | date=October 2002
| bibcode=2002A&A...393..897R | arxiv=astro-ph/0205255
| doi=10.1051/0004-6361:20020943 | s2cid=14070763 }}
}}
{{Stars of Camelopardalis}}
{{DEFAULTSORT:BN Camelopardalis}}
Category:B-type main-sequence stars
Category:Alpha2 Canum Venaticorum variables