Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..123..209d&link_type=abstract
A & A Supplement series, Vol. 123, Jun I 1997, 209-218.
Astronomy and Astrophysics
Astronomy
16
Stars: Spectroscopic, Stars: Fundamental Parameters, Binaries: Stars Individual: Sigma Gem
Scientific paper
26 high quality radial velocity measurements of the RS CVn star sigma Gem taken in 1993, 1994, and 1995 are used in combination with older measurements to fit a new radial velocity curve. Essentially, the orbital parameters given by \cite[Bopp \& Dempsey (1989)]{BD89} are confirmed. However, the orbit turns out to be circular. sigma Gem is known as a single-lined binary, and also in the new spectra no trace of the secondary is found. However, combining the orbital with rotational parameters, constraints on the fundamental parameters can be found: the inclination, the radius and the two masses. The inclination is high; the mass of the primary seems to be normal for a K1 giant, its radius, however, seems to be too small. Based on observations collected at the Nordic Optical Telescope (NOT), La Palma, Spain. Table \ref{T-RV} is also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html.
Duemmler Rudolf
Ilyin Ilya V.
Tuominen Ilkka
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