BG Geminorum

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name=BG Geminorum Starbox image

binary star system BG Geminorum]
caption= Starbox observe
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epoch=J2000.0 (ICRS)
ra=RA|06|03|30.81
dec=DEC|+27|41|50.7
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BG Geminorum is long period binary star system which contains a K0 I secondary star in orbit around a primary star. The primary star has a mass at least 3.5 times that of the sun and could either be a B star (see Stellar Classification) or a black hole. Material from the K0 star is transferred to an accretion disk surrounding the unidentified primary star.

History

"BG Gem" was first observed by Hoffmeister (1933) and Jensch (1938) - initially an RV Tau star candidate with an uncertain period of ~ 60 days and a photographic magnitude of ~ 14. Until 1992, BG Gem remained in the General Catalog of Variable Stars ( [http://www.sai.msu.su/gcvs/gcvs/ GCVS] ), when Benson et al. (2000) discovered an ellipsoidal variation with a optical magnitude of about 0.5, and improved the accuracy of the period to 91.645 days. Using light curves, a deep primary eclipse was revealed at shorter wavelengths (less than 4400Å), and a shallow eclipse at longer wavelengths. [Priscilla Benson, Allyn Dullighan, Alceste Bonanos, K. K. McLeod, and Scott J. Kenyon, "An Optical Study of BG Geminorum: An Ellipsoidal Binary with an Unseen Primary Star", The Astronomical Journal, volume 119 (2000), pages 890–900] .

External links

* [http://cfa-www.harvard.edu/~kenyon/bg/ BG Geminorum]
* [http://www.wellesley.edu/PublicAffairs/Releases/2000/011400.html Wellesley College News Release]
* [http://simbad.harvard.edu/sim-id.pl?protocol=html&Ident=BG+Geminorum&NbIdent=1&Radius=10&Radius.unit=arcmin&CooFrame=FK5&CooEpoch=2000&CooEqui=2000&output.max=all&o.catall=on&output.mesdisp=N&Bibyear1=1983&Bibyear2=2006&Frame1=FK5&Frame2=FK4&Frame3=G&Equi1=2000&Equi2=1950&Equi3=2000&Epoch1=2000&Epoch2=1950&Epoch3=2000 Simbad Query Result for BG Geminorum]

References