Beta Chamaeleontis

From Wikipedia, the free encyclopedia
Jump to: navigation, search
β Chamaeleontis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 12h 18m 20.82459s[1]
Declination −79° 18′ 44.0710″[1]
Apparent magnitude (V) 4.24[2] (4.24 to 4.30[3])
Characteristics
Spectral type B4 V[4]
U−B color index −0.52[2]
B−V color index −0.13[2]
R−I color index −0.10[5]
Astrometry
Radial velocity (Rv) +23.0[6] km/s
Proper motion (μ) RA: −37.97[1] mas/yr
Dec.: +11.15[1] mas/yr
Parallax (π) 10.93 ± 0.15[1] mas
Distance 298 ± 4 ly
(91 ± 1 pc)
Absolute magnitude (MV) −0.57[7]
Details
Mass 5.0±0.1[8] M
Radius 2.84±0.13[9] R
Luminosity 212[10] L
Surface gravity (log g) 4.03±0.05[9] cgs
Temperature 14,495±157[9] K
Rotational velocity (v sin i) 255[5] km/s
Age 22.7±7.2[8] Myr
Other designations
β Cha, Beta Chamaeleontis, Beta Cha, CD−78 495, CPD−78 741, FK5 459, GC 16775, HD 106911, HIP 60000, HR 4674, PPM 371459, SAO 256924.[11]
Database references
SIMBAD data

Beta Chamaeleontis, Latinized from β Chamaeleontis, is a B-type main sequence star and is the third-brightest star in the constellation of Chamaeleon.[11] It has an apparent visual magnitude that varies between 4.24 and 4.30.[3]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752Freely accessible, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357. 
  2. ^ a b c 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. ^ 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. ^ a b 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.
  6. ^ 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. 
  7. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  8. ^ a b 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:1007.4883Freely accessible, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x 
  9. ^ a b c 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/0412542Freely accessible, Bibcode:2005AJ....129.1642F, doi:10.1086/427855 
  10. ^ 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:1208.2037Freely accessible, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x. 
  11. ^ a b "bet Cha -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-10.