PROFILPELAJAR.COM

	BN Camelopardalis
Observationsdata; Epok: J2000.0
Stjärnbild	Giraffen
Rektascension	05t 12m 22,43769s
Deklination	+73° 56′ 48,03820 ″
Skenbar magnitud ()	5,49 (5,34 – 5,58)
Stjärntyp
Spektraltyp	B9.5 VpSi
B–V	-0,108 ± 0,003
Variabeltyp	Alfa2 Canum Venaticorum
Astrometri
Radialhastighet ()	+9,3 ± 2,8 km/s
Egenrörelse (µ)	RA: +6,033 mas/år; Dek.: -27,088 mas/år
Parallax ()	10,5286 ± 0,2275
Avstånd	310 ± 7 lå (95 ± 2 pc)
Absolut magnitud ()	+0,13
Detaljer
Massa	3,05 ± 0,13 M☉
Radie	2,9 ± 0,4 R☉
Luminositet	110 L☉
Temperatur	11 561 K
Vinkelhastighet	23 km/s
Andra beteckningar
	HD 32650, AG+73 136, BD+73 274, FK5 2387, GSC 04355-01445, HIC 24254, HIP 24254, HR 1643, 2MASS J05122243+7356479, PLX 1141, PPM 5879, SAO 5455, TD1 3964, TYC 4355-1445-1, uvby98 100032650, V* BN Cam, Gaia DR2 502574262409317504

BN Camelopardalis, är en misstänkt astrometrisk dubbelstjärna^[10] i den mellersta delen av stjärnbilden Giraffen. Den har en genomsnittlig skenbar magnitud av ca 5,49^[2] och är svagt synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallax enligt Gaia Data Release 2 på ca 10,5 mas,^[1] beräknas den befinna sig på ett avstånd på ca 310 ljusår (ca 95 parsek) från solen. Den rör sig bort från solen med en heliocentrisk radialhastighet på ca 9 km/s.^[2]

Egenskaper

Primärstjärnan BN Camelopardalis är en blå till vit stjärna i huvudserien av spektralklass B9.5 VpSi^[4] och är en svagt magnetisk,^[11] kemiskt ovanlig stjärna^[12]^[13] med ett avvikande överskott av kisel. Den har en massa som är ca 3^[5] solmassor, en radie som är ca 3^[6] solradier och har ca 110 gånger solens utstrålning av energi^[5] från dess fotosfär vid en effektiv temperatur av ca 11 600 K.^[5]

Ljuskurva för BN Camelopardalis i visuella bandet, anpassad från Adelman (1997)^[14]

BN Camelopardalis är en variabel stjärna^[15] som varierar i luminositet från 5,34 ner till 5,58. Sedan 2017 har den kategoriserats som en Alfa2 Canum Venaticorum-variabel med en period på 2,7347 dygn,^[3] medan Adelman och Sutton (2007) observerade en period på 2,73501 dygn.^[12]

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, BN Camelopardalis, 27 mars 2022.

Noter

^ [a b c d e f] 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] 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] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
^ [a b] Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement Series, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
^ [a b c d e f] Netopil, Martin; Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus (2017). "An investigation of the rotational properties of magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 468 (3): 2745–2756. arXiv:1703.05218. Bibcode:2017MNRAS.468.2745N. doi:10.1093/mnras/stx674. S2CID 119215348.
^ [a b] North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N.
^ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763
^ BN Cam (unistra.fr). Hämtad 2022-10-14.
^ "BN Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2019-08-14.
^ 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.
^ Aurière, M.; et al. (December 2007), "Weak magnetic fields in Ap/Bp stars. Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy", Astronomy and Astrophysics, 475 (3): 1053–1065, arXiv:0710.1554, Bibcode:2007A&A...475.1053A, doi:10.1051/0004-6361:20078189, S2CID 54850596.
^ [a b] Adelman, Saul J.; Sutton, Jason M. (July 2007), "FCAPT uvby Photometry of the mCP Stars BN Cam, EP Vir, FF Vir, and HD 184905", The Publications of the Astronomical Society of the Pacific, 119 (857): 733–741, Bibcode:2007PASP..119..733A, doi:10.1086/520627.
^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788
^ Adelman, Saul J. (January 1997). "Strömgren uvby Photometry of the Magnetic Chemically Peculiar Stars HR 1643, θ Aur, 49 Cam, and HR 3724". Publications of the Astronomical Society of the Pacific. 109: 9–14. doi:10.1086/133853. Hämtad 9 november 2021.
^ Watson, Christopher (4 January 2010). "BN Camelopardalis". The International Variable Star Index. American Association of Variable Star Observers. Hämtad 26 maj 2015.

Externa länkar

https://www.universeguide.com/star/24254/bncamelopardalis.

[B-1] [a b c d e f] 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.

[C-2] [a b c d e f] 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.

[D-3] [a b c] Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61 (1): 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.

[E-4] [a b] Abt, Helmut A.; Morrell, Nidia I. (1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement Series, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.

[F-5] [a b c d e f] Netopil, Martin; Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus (2017). "An investigation of the rotational properties of magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 468 (3): 2745–2756. arXiv:1703.05218. Bibcode:2017MNRAS.468.2745N. doi:10.1093/mnras/stx674. S2CID 119215348.

[G-6] [a b] North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics, 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N.

[H-7] Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393 (3): 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943, S2CID 14070763

[SIMBAD-8] BN Cam (unistra.fr). Hämtad 2022-10-14.

[I-9] "BN Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2019-08-14.

[J-10] 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.

[K-11] Aurière, M.; et al. (December 2007), "Weak magnetic fields in Ap/Bp stars. Evidence for a dipole field lower limit and a tentative interpretation of the magnetic dichotomy", Astronomy and Astrophysics, 475 (3): 1053–1065, arXiv:0710.1554, Bibcode:2007A&A...475.1053A, doi:10.1051/0004-6361:20078189, S2CID 54850596.

[L-12] [a b] Adelman, Saul J.; Sutton, Jason M. (July 2007), "FCAPT uvby Photometry of the mCP Stars BN Cam, EP Vir, FF Vir, and HD 184905", The Publications of the Astronomical Society of the Pacific, 119 (857): 733–741, Bibcode:2007PASP..119..733A, doi:10.1086/520627.

[M-13] Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788

[A-14] Adelman, Saul J. (January 1997). "Strömgren uvby Photometry of the Magnetic Chemically Peculiar Stars HR 1643, θ Aur, 49 Cam, and HR 3724". Publications of the Astronomical Society of the Pacific. 109: 9–14. doi:10.1086/133853. Hämtad 9 november 2021.

[N-15] Watson, Christopher (4 January 2010). "BN Camelopardalis". The International Variable Star Index. American Association of Variable Star Observers. Hämtad 26 maj 2015.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

[12]

[13]

[14]

[15]