BG Geminorum
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Gemini |
Right ascension | 06h 03m 30.81s[1] |
Declination | +27° 41′ 50.7″[1] |
Apparent magnitude (V) | 12.9 - 13.6[2] |
Characteristics | |
Spectral type | K0I[2] |
Apparent magnitude (g) | 12.83[3] |
Astrometry | |
Proper motion (μ) | RA: 0.209±0.021[3] mas/yr Dec.: -0.385±0.015[3] mas/yr |
Parallax (π) | 0.206 ± 0.020[3] mas |
Distance | 16,000 ± 2,000 ly (4,900 ± 500 pc) |
Orbit[2] | |
Period (P) | 91.645 days |
Semi-major axis (a) | >0.63 ± 0.04 AU |
Inclination (i) | >80° |
Details | |
K0I | |
Mass | >0.7[4] M☉ |
Temperature | 4,500[2] K |
Black hole or class B | |
Mass | >3.5[4] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
BG Geminorum is an eclipsing binary star system in the constellation Gemini. It consists of a K0 supergiant with a more massive but unseen companion. The companion is likely to be either a black hole or class B star. Material from the K0 star is being transferred to an accretion disk surrounding the unidentified object.[4]
References[]
- ^ a b Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.
- ^ a b c d Benson, Priscilla J (2000). "An Optical Study of BG Geminorum: An Ellipsoidal Binary with an Unseen Primary Star". The Astronomical Journal. 119 (2): 890–900. arXiv:astro-ph/9911179. Bibcode:2000AJ....119..890B. doi:10.1086/301230. S2CID 13393881.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. Gaia EDR3 record for this source at VizieR.
- ^ a b c Kenyon, Scott J (2002). "The Eclipsing Binary BG Geminorum: Improved Constraints on the Orbit and the Structure of the Accretion Disk". The Astronomical Journal. 124 (2): 1054–1059. arXiv:astro-ph/0205157. Bibcode:2002AJ....124.1054K. doi:10.1086/341651. S2CID 15455657.
Categories:
- K-type supergiants
- Eclipsing binaries
- Gemini (constellation)
- Objects with variable star designations
- 2MASS objects
- Supergiant-star stubs
- Variable star stubs