| 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 mas [1] |
| 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 | |
| Database references | |
| SIMBAD | data |
Beta Chamaeleontis, Latinized from β Chamaeleontis, is the third-brightest star in the southern constellation of Chamaeleon. A solitary, [12] suspected variable star, 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. [3] Parallax measurements yield a distance estimate of 298 light years from the Sun, and it is drifting further away with a radial velocity of +23 km/s. [6]
This is a B-type main-sequence star with a stellar classification of B4 V [4] that is generating energy through core hydrogen fusion. It has been catalogued both as a Be star [2] and a normal star. [13] This object is about 23 [8] million years old with a high projected rotational velocity of 255 km/s. [5] The rapid rotation is creating an equatorial bulge that is 12% larger than the polar radius. [14] The star has five [8] times the mass of the Sun and 2.8 [9] times the Sun's radius. It is radiating 212 [10] times the luminosity of the Sun from its photosphere at an effective temperature of 14,495 K. [9]
- ^ a b c d e 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.
- ^ 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.
- ^ a b 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.
- ^ a b Houk, N.; Cowley, A. P. (1975), "Catalogue of two-dimensional spectral types for the HD stars", University of Michigan, I, Bibcode: 1975mcts.book.....H
- ^ a b c 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.
- ^ a b 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.
- ^ 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 d 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
- ^ a b c d e 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
- ^ 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.1365-2966.2012.21873.x, S2CID 118665352.
-
^
"bet Cha".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2016-12-10.
{{ cite web}}: CS1 maint: postscript ( link) - ^ 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.
| 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 mas [1] |
| 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 | |
| Database references | |
| SIMBAD | data |
Beta Chamaeleontis, Latinized from β Chamaeleontis, is the third-brightest star in the southern constellation of Chamaeleon. A solitary, [12] suspected variable star, 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. [3] Parallax measurements yield a distance estimate of 298 light years from the Sun, and it is drifting further away with a radial velocity of +23 km/s. [6]
This is a B-type main-sequence star with a stellar classification of B4 V [4] that is generating energy through core hydrogen fusion. It has been catalogued both as a Be star [2] and a normal star. [13] This object is about 23 [8] million years old with a high projected rotational velocity of 255 km/s. [5] The rapid rotation is creating an equatorial bulge that is 12% larger than the polar radius. [14] The star has five [8] times the mass of the Sun and 2.8 [9] times the Sun's radius. It is radiating 212 [10] times the luminosity of the Sun from its photosphere at an effective temperature of 14,495 K. [9]
- ^ a b c d e 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.
- ^ 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.
- ^ a b 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.
- ^ a b Houk, N.; Cowley, A. P. (1975), "Catalogue of two-dimensional spectral types for the HD stars", University of Michigan, I, Bibcode: 1975mcts.book.....H
- ^ a b c 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.
- ^ a b 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.
- ^ 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 d 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
- ^ a b c d e 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
- ^ 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.1365-2966.2012.21873.x, S2CID 118665352.
-
^
"bet Cha".
SIMBAD.
Centre de données astronomiques de Strasbourg. Retrieved 2016-12-10.
{{ cite web}}: CS1 maint: postscript ( link) - ^ 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.