J Centauri (J Cen) is a star in the constellation Centaurus. Its mean apparent magnitude is 4.5, making it easily visible to the naked eye. It is approximately 350 light years from Earth.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 13h 22m 37.9371s[1] |
| Declination | –60° 59′ 18.215″[1] |
| Apparent magnitude (V) | +4.505[2] |
| Characteristics | |
| Spectral type | B3V[3] |
| U−B color index | –0.62[4] |
| B−V color index | –0.13[4] |
| Astrometry | |
| Radial velocity (Rv) | +6.0[5] km/s |
| Proper motion (μ) | RA: −35.50[1] mas/yr Dec.: −15.19[1] mas/yr |
| Parallax (π) | 9.20 ± 0.58 mas[1] |
| Distance | 350 ± 20 ly (109 ± 7 pc) |
| Details | |
| Luminosity | 500[6] L☉ |
| Surface gravity (log g) | 4.22[6] cgs |
| Temperature | 23,970 ± 3,080[7] K |
| Rotational velocity (v sin i) | 223[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
J Centauri is a spectral class B3V main sequence star with a luminosity 500 times that of the Sun. The temperature of the star's photosphere is nearly 24,000 K. The rotation velocity at the equator is at least 223 km/s.[8] It is believed to be a binary star system.[9]
This star may be a member of the Scorpio-Centaurus OB association (Sco OB2). This is one of the nearest regions of recent star formation.[10]
References
edit- ^ a b c d e Perryman, M. A. C.; Lindegren; Kovalevsky; Hoeg; Bastian; Bernacca; Crézé; Donati; Grenon; et al. (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics. 323: L49–L52. Bibcode:1997A&A...323L..49P.
- ^ a b "CCDM J13226-6059AB -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-09-08.
- ^ Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (July 1969). "MK Spectral Types for Bright Southern OB Stars". The Astrophysical Journal. 157: 313. Bibcode:1969ApJ...157..313H. doi:10.1086/150069.
- ^ a b Landolt, Arlo U. (August 1969). "UBV Observations of Selected Double Systems, II". Publications of the Astronomical Society of the Pacific. 81 (481): 443–446. Bibcode:1969PASP...81..443L. doi:10.1086/128801.
- ^ Jilinski, E.; Daflon, S.; Cunha, K.; de La Reza, R. (March 2006). "Radial velocity measurements of B stars in the Scorpius–Centaurus association". Astronomy and Astrophysics. 448 (3): 1001–1006. arXiv:astro-ph/0601643. Bibcode:2006A&A...448.1001J. doi:10.1051/0004-6361:20041614. S2CID 17818058.
- ^ a b de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989). "Physical parameters of stars in the Scorpio-Centaurus OB association". Astronomy and Astrophysics. 216 (1–2): 44–61. Bibcode:1989A&A...216...44D.
- ^ Sokolov, N. A. (May 1995). "The determination of T_eff_ of B, A and F main sequence stars from the continuum between 3200 A and 3600 A". Astronomy and Astrophysics Supplement. 110: 553–564. Bibcode:1995A&AS..110..553S.
- ^ a b Wolff, S. C.; et al. (2007). "Rotational Velocities for B0-B3 Stars in Seven Young Clusters: Further Study of the Relationship between Rotation Speed and Density in Star-Forming Regions". The Astronomical Journal. 133 (3): 1092–1103. arXiv:astro-ph/0702133. Bibcode:2007AJ....133.1092W. doi:10.1086/511002. S2CID 119074863.
- ^ Shatsky, N.; Tokovinin, A. (2002). "The mass ratio distribution of B-type visual binaries in the Sco OB2 association". Astronomy and Astrophysics. 382: 92–103. arXiv:astro-ph/0109456. Bibcode:2002A&A...382...92S. doi:10.1051/0004-6361:20011542. S2CID 16697655.
- ^ Lub, J.; de Geus, E. J.; van de Grift, E. (October 1990). "Walraven photometry of nearby southern OB associations". Astronomy and Astrophysics Supplement Series. 85 (2): 915–970. Bibcode:1990A&AS...85..915D.