BG Geminorum
Satellite image of binary star system BG Geminorum
Satellite image of binary star system 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]
Distance16,000 ± 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☉
Temperature4,500[2] K
Black hole or class B
Mass>3.5[3] M☉
Other designations
BG Geminorum, 2MASS J06033081+2741506
Database references
SIMBADdata
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. 1 2 3 4 5 6 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.
  2. 1 2 3 4 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.
  3. 1 2 3 4 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.
  4. ↑ "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022.


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