Astrometric-spectroscopic binaries. II - Gamma Geminorum

Details Astrometric-spectroscopic binaries. II - Gamma Geminorum Astrometric-spectroscopic binaries. II - Gamma Geminorum

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1302k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Nov. 1987, p. 1302-1308.

Astronomy and Astrophysics

Astronomy

12

Astrometry, Binary Stars, Stellar Spectrophotometry, Distance, Radial Velocity, Stellar Parallax

Scientific paper

Using astrometric observations from the Allegheny, Yale, and Van Vleck Observatories combined with the 447 radial velocities available to them, the authors have derived a definitive astrometric-spectroscopic orbit for the bright A0 IV star γ Geminorum. The orbital period is 12.632 yr, but the unusually high eccentricity, 0.896, causes most of the rise from minimum to maximum velocity to occur over an interval of only two months. In addition, the authors find a well-determined trigonometric parallax of 0arcsec.0326±0arcsec.0025 and a provisional orbital parallax of 0arcsec.0300±0arcsec.0026.

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