SPECTROSCOPIC BINARY ORBITS FROM PHOTOELECTRIC RADIAL VELOCITIES

摘要

HR 978 is a 6(m) late-G star at the southern border of Perseus, nearly 40 minutes of time preceding, and just 18 minutes of arc north of, the third-magnitude B star zeta Per. In the Bright Star Catalogue its spectral type is listed as G8 IV, and its photometry is given as V = 6(m).06, (B - V) = o(m).99, (U - B) = o(m).68, but low-amplitude photometric variations have subsequently been suspected. A generous number of radial-velocity observations shows it to be a spectroscopic binary in an orbit of low eccentricity with a period just short of 3 years.