Beta Chamaeleontis Star in the constellation Chamaeleon
Beta Chamaeleontis
Location of β Chamaeleontis (circled in red)
Observation dataEpoch J2000.0 Equinox J2000.0 (ICRS )
Constellation Chamaeleon [ 1]
Right ascension 12h 18m 20.82459s [ 2]
Declination −79° 18′ 44.0710″ [ 2]
Apparent magnitude (V)4.24[ 3] (4.24 to 4.30) [ 4]
Characteristics
Evolutionary stage main sequence [ 5]
Spectral type B4 V[ 6] IV[ 7]
U−B color index
−0.52[ 3]
B−V color index
−0.13[ 3]
R−I color index
−0.10[ 8]
Variable type SPB [ 7]
Astrometry Radial velocity (Rv )+23.0[ 9] km/s Proper motion (μ) RA: −37.97 mas /yr [ 2] Dec.: +11.15 mas /yr [ 2] Parallax (π)10.93± 0.15 mas [ 2] Distance 298 ± 4 ly pc ) Absolute magnitude (MV )−0.57[ 1] Details Mass ± 0.1[ 10] M ☉ Radius ± 0.13[ 11] R ☉ Luminosity 212[ 12] L ☉ Surface gravity (log g )± 0.05[ 11] cgs Temperature ± 157[ 11] K Rotational velocity (v sin i )255[ 8] km/s Age ± 7.2[ 10] Myr Other designations β Cha , CD −78°495CPD −78°741FK5 459GC 16775HD 106911HIP 60000HR 4674SAO 256924PPM 371459[ 13] Database references SIMBAD data
Beta Chamaeleontis is the third-brightest star in the southern constellation of Chamaeleon . Its name is a Bayer designation that is Latinized from β Chamaeleontis , and abbreviated Beta Cha or β Cha. A solitary,[ 14] variable star ,[ 4] naked eye as a faint blue-white point of light with an apparent visual magnitude that has been measured ranging between 4.24 and 4.30.[ 4] Parallax measurements yield a distance estimate of 298 light-years (91 pc ) from the Sun. It is drifting further away with a radial velocity of +23 km/s.[ 9]
This is a B-type main-sequence star with a stellar classification of B4 V[ 6] core hydrogen fusion . It has been catalogued both as a Be star [ 3] [ 15] pulsation measurements made by the TESS space telescope , this is a slowly pulsating B-type variable.[ 7]
Beta Chamaeleontis is about 23[ 10] million years old with a high projected rotational velocity of 255 km/s.[ 8] equatorial bulge that is 12% larger than the polar radius.[ 16] [ 10] mass of the Sun and 2.8[ 11] Sun's radius . It is radiating 212[ 12] luminosity of the Sun from its photosphere at an effective temperature of 14,495 K.[ 11]
References
1 2 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 XHIP record for this object at VizieR .1 2 3 4 5 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 , S2CID 18759600 . 1 2 3 4 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 1 2 3 Samus', N. N; et al. (2017), "General catalogue of variable stars", Astronomy Reports , 5.1, 61 (1): 80, Bibcode :2017ARep...61...80S , doi :10.1134/S1063772917010085 , S2CID 125853869 . ↑ 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 .1 2 Houk, N.; Cowley, A. P. (1975), "Catalogue of two-dimensional spectral types for the HD stars", University of Michigan , I , Bibcode :1975mcts.book.....H 1 2 3 Balona, L. A.; Ozuyar, D. (2020), "Pulsation among TESS a and B stars and the Maia variables", Monthly Notices of the Royal Astronomical Society , 493 (4): 5871, arXiv :2001.04497 Bibcode :2020MNRAS.493.5871B , doi :10.1093/mnras/staa670 1 2 3 Hoffleit, D.; Warren, Jr., W. H., "HR 4674, database entry" , The Bright Star Catalogue (5th Revised (Preliminary Version) ed.), Centre de Données astronomiques de Strasbourg , retrieved September 5, 2008 . V/50 .1 2 Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg , 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode :1999VeARI..35....1W . 1 2 3 4 Tetzlaff, N.; et al. (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 S2CID 118629873 1 2 3 4 5 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 , S2CID 119512018 1 2 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.1365-2966.2012.21873.x S2CID 118665352 . ↑ "bet Cha" , SIMBAD Centre de données astronomiques de Strasbourg , retrieved 2016-12-10 .↑ 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 . ↑ Grady, C. A.; et al. (September 1987), "Highly Ionized Stellar Winds in Be Stars: The Evidence for Aspect Dependence", Astrophysical Journal , 320 : 376, Bibcode :1987ApJ...320..376G , doi :10.1086/165551 ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review , 20 (1): 51, arXiv :1204.2572 Bibcode :2012A& ARv..20...51V , doi :10.1007/s00159-012-0051-2 , S2CID 119273474 .
