Beta Chamaeleontis
  | |
| Observation data Epoch 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] or B5 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 (91 ± 1 pc) |
| Absolute magnitude (MV) | −0.57[1] |
| Details | |
| Mass | 5.0±0.1[10] M☉ |
| Radius | 2.84±0.13[11] R☉ |
| Luminosity | 212[12] L☉ |
| Surface gravity (log g) | 4.03±0.05[11] cgs |
| Temperature | 14,495±157[11] K |
| Rotational velocity (v sin i) | 255[8] km/s |
| Age | 22.7±7.2[10] Myr |
| Other designations | |
| β Cha, CD−78°495, CPD−78°741, FK5 459, GC 16775, HD 106911, HIP 60000, HR 4674, SAO 256924, PPM 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] suspected variable star,[4] it is visible to the 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] that is generating energy through core hydrogen fusion. It has been catalogued both as a Be star[3] and a normal star.[15] Based on 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] The rapid rotation is creating an equatorial bulge that is 12% larger than the polar radius.[16] The star has five[10] times the mass of the Sun and 2.8[11] times the Sun's radius. It is radiating 212[12] times the luminosity of the Sun from its photosphere at an effective temperature of 14,495 K.[11]
References
[edit]- 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. ID 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.
