BG Crucis
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Crux |
Right ascension | 12h 31m 40.33011s[1] |
Declination | −59° 25′ 26.1224″[1] |
Apparent magnitude (V) | 5.49[2] (5.34 - 5.58)[3] |
Characteristics | |
Spectral type | F7Ib/II[4] (F5Ib - G0p)[3] |
B−V color index | ±0.012 0.622[2] |
Astrometry | |
Radial velocity (Rv) | ±2.2 −19.3[5] km/s |
Proper motion (μ) | RA: −12.689[1] mas/yr Dec.: −4.110[1] mas/yr |
Parallax (π) | 1.7777 ± 0.0873[1] mas |
Distance | 1,830 ± 90 ly (560 ± 30 pc) |
Absolute magnitude (MV) | −2.63[2] |
Details | |
Mass | 4.3[6] M☉ |
Luminosity | 1,033.93[2] L☉ |
Surface gravity (log g) | 2.15[6] cgs |
Temperature | ±30 6,253[6] K |
Rotational velocity (v sin i) | ±1.8 22.0[7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
BG Crucis is a star in the southern constellation of Crux. A classical Cepheid variable, its apparent magnitude ranges from 5.34 to 5.58 over 3.3428 days.[3] A yellow-white supergiant that pulsates between spectral types F5Ib and G0p, it is around 4.3 times as massive and 2,000 times as luminous as the Sun.[6]
References
- 1 2 3 4 5 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- 1 2 3 4 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.
- 1 2 3 Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
- ↑ Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
- 1 2 3 4 Usenko, I. A.; et al. (2014). "Spectroscopic studies of southern-hemisphere Cepheids: Three Cepheids in Crux (BG Cru, R Cru, and T Cru)". Astronomy Letters. 40 (7): 435. Bibcode:2014AstL...40..435U. doi:10.1134/S106377371407007X.
- ↑ Ammler-von Eiff, M.; Reiners, A. (June 2012). "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?". Astronomy & Astrophysics. 542: A116. arXiv:1204.2459. Bibcode:2012A&A...542A.116A. doi:10.1051/0004-6361/201118724.
- ↑ "TU Crv". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 August 2018.
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