Astronomy:BG Geminorum
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Short description: Star in the constellation Gemini
 | |
| Observation data Epoch J2000.0 Equinox (celestial coordinates) | |
|---|---|
| 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[1] mas/yr Dec.: −0.385±0.015[1] mas/yr |
| Parallax (π) | 0.2057 ± 0.0197[1] 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 | |
| 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 |
A visual band light curve for BG Geminorum, plotted from ASAS-SN data[4]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 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. doi:10.1086/301230. Bibcode: 2000AJ....119..890B.
- ↑ 3.0 3.1 3.2 3.3 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. doi:10.1086/341651. Bibcode: 2002AJ....124.1054K.
- ↑ "ASAS-SN Variable Stars Database". ASAS-SN. https://asas-sn.osu.edu/variables/lookup.
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