Research output: Contribution to journal › Article
BG Gem - a Poorly-Studied Binary with a Possible Black Hole Component. / Drake, N.A.; Miroshnichenko, A.S.; Danford, S.; Pereira, C.B.
In: Central European astrophysical bulletin, Vol. 37, No. 1, 2013, p. 261-266.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - BG Gem - a Poorly-Studied Binary with a Possible Black Hole Component
AU - Drake, N.A.
AU - Miroshnichenko, A.S.
AU - Danford, S.
AU - Pereira, C.B.
PY - 2013
Y1 - 2013
N2 - BG Gem is an eclipsing binary with a 91.6-day orbital period. The more massive primary component does not seem to show absorption lines in the spectrum, while the less massive secondary is thought to be a K-type star, possibly a supergiant. These results were obtained with optical low-resolution spectroscopy and photometry. The primary was suggested to be a black hole, although with a low confidence. We present a high-resolution optical spectrum of the system along with new BVR-photometry. Analysis of the spectrum shows that the K-type star rotates rapidly at v sin i = 18 km s^{-1} compared to most evolved stars of this temperature range. We also discuss constraints on the secondary's luminosity using spectroscopic criteria and on the entire system parameters using both the spectrum and photometry.
AB - BG Gem is an eclipsing binary with a 91.6-day orbital period. The more massive primary component does not seem to show absorption lines in the spectrum, while the less massive secondary is thought to be a K-type star, possibly a supergiant. These results were obtained with optical low-resolution spectroscopy and photometry. The primary was suggested to be a black hole, although with a low confidence. We present a high-resolution optical spectrum of the system along with new BVR-photometry. Analysis of the spectrum shows that the K-type star rotates rapidly at v sin i = 18 km s^{-1} compared to most evolved stars of this temperature range. We also discuss constraints on the secondary's luminosity using spectroscopic criteria and on the entire system parameters using both the spectrum and photometry.
KW - emission-line stars
KW - circumstellar matter
KW - binary systems
KW - fundamental parameters
M3 - Article
VL - 37
SP - 261
EP - 266
JO - Central European astrophysical bulletin
JF - Central European astrophysical bulletin
SN - 1845-8319
IS - 1
ER -
ID: 5626745