BG Geminorum
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Gemini |
| Right ascension | 06h 03m 30.81s[1] |
| Declination | +27° 41′ 50.6″[1] |
| Apparent magnitude (V) | 12.9 - 13.6[2] |
| Characteristics | |
| Spectral type | K0I[2] |
| Apparent magnitude (g) | 12.83[1] |
| Variable type | eclipsing[3] |
| Astrometry | |
| Proper motion (μ) | RA: 0.209±0.021 mas/yr[1] Dec.: −0.385±0.015 mas/yr[1] |
| Parallax (π) | 0.2057 ± 0.0197 mas[1] |
| 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 | |
| Supergiant | |
| Mass | >0.7[3] M☉ |
| Temperature | 4,500[2] K |
| Black hole or class B | |
| Mass | >3.5[3] 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.[3]
References
[edit]- ^ a b c d e 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.
- ^ 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 d 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.
- ^ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022.
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