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Beta Chamaeleontis

Beta Chamaeleontis (β)
Observationsdata
Epok: J2000.0
StjärnbildKameleonten
Rektascension12t 18m 20,82459s[1]
Deklination-79° 18′ 44,0710″[1]
Skenbar magnitud ()+4,24[2] (4,24 till 4,30[3])
Stjärntyp
SpektraltypB4 V[4]
U–B-0,52[2]
B–V-0,13[2]
Astrometri
Radialhastighet ()+23,0[5] km/s
Egenrörelse (µ)RA: -37,97[1] mas/år
Dek.: +11,15[1] mas/år
Parallax ()10,93 ± 0,15[1]
Avstånd298 ± 4 lå (91 ± 1 pc)
Absolut magnitud ()-0,57[6]
Detaljer
Massa5,0 ± 0,1[7] M☉
Radie2,84 ± 0,13[8] R☉
Luminositet212[9] L☉
Temperatur14 495 ± 157[8] K
Vinkelhastighet255[10] km/s
Ålder22,7 ± 7,2[7] miljoner år
Andra beteckningar
Beta Cha, CD-78495, CPD -78 741, FK5 459, GC 16775, HD 106911, HIP 60000, HR 4674, PPM 371459, SAO 256924. [11]

Beta Chamaeleontis (β Chamaeleontis, förkortat Beta Cha, β Cha) som är stjärnans Bayerbeteckning, är en ensam stjärna belägen i den östra delen av stjärnbilden Kameleonten. Den har en kombinerad skenbar magnitud på 4,24[2], som varierar mellan 4,24 och 4,30[3], och är synlig för blotta ögat där ljusföroreningar ej förekommer. Baserat på parallaxmätning inom Hipparcosuppdraget på ca 10,9[1] mas, beräknas den befinna sig på ett avstånd på ca 298 ljusår (ca 91 parsek) från solen.

Egenskaper

Beta Chamaeleontis är en blå till vit stjärna i huvudserien av spektralklass B4 V[4]. Den har en massa som är ca 5[7] gånger större än solens massa, en radie som är ca 2,8[8] gånger större än solens och utsänder från dess fotosfär ca 212[9] gånger mera energi än solen vid en effektiv temperatur på ca 14 500 K.[8]

Källor

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, tidigare version.

Referenser

  1. ^ [a b c d e f] van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752 , Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357.
  2. ^ [a b c d] Feinstein, A.; Marraco, H. G. (November 1979), "The photometric behavior of Be Stars", Astronomical Journal, 84: 1713–1725, Bibcode:1979AJ.....84.1713F, doi:10.1086/112600.
  3. ^ [a b] NSV 5532, database entry, New Catalogue of Suspected Variable Stars, the improved version, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line September 5, 2008.
  4. ^ [a b] Houk, N.; Cowley, A. P. (1975), "Catalogue of two-dimensional spectral types for the HD stars", University of Michigan, I, Bibcode:1975MSS...C01....0H
  5. ^ Wielen, R.; et al. (1999), Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions (35), Astronomisches Rechen-Institut Heidelberg, Bibcode:1999VeARI..35....1W.
  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.
  7. ^ [a b c] Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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
  8. ^ [a b c d] Fitzpatrick, E. L.; Massa, D. (March 2005), "Determining the Physical Properties of the B Stars. II. Calibration of Synthetic Photometry", The Astronomical Journal, 129 (3): 1642–1662, arXiv:astro-ph/0412542 , Bibcode:2005AJ....129.1642F, doi:10.1086/427855
  9. ^ [a b] McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037 , Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012="G".21873.x.
  10. ^ HR 4674, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 5, 2008.
  11. ^ "bet Cha". SIMBAD. Centre de données astronomiques de Strasbourg. Hämtad 2016-12-10.

Externa länkar

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