view Abstract Citations (291) References (55) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Search for Substellar Companions to Solar-type Stars Campbell, Bruce ; Walker, G. A. H. ; Yang, S. Abstract Relative radial velocities with a mean external error of 13 m/s rms have been obtained for 12 late-type dwarfs and four subgiants over the past six years. Two stars, Chi1 Ori A and Gamma Cep, show large velocity variations probably due to stellar companions. In contrast, the remaining 14 stars are virtually constant in velocity, showing no changes larger than about 50 m/s. No obvious variations due to effects other than center-of-mass motion, including changes correlated with chromospheric activity, are observed. Seven stars show small, but statistically significant, long-term trends in the relative velocities. These cannot be due to about 10-80 Jupiter mass brown dwarfs in orbits with P less than about 50 yr, since these would have been previously detected by conventional astrometry; companions of about 1-9 Jupiter masses are inferred. Since relatively massive brown dwarfs are rare or nonexistent, at least as companions to normal stars, these low-mass objects could represent the tip of the planetary mass spectrum. Observations are continuing to confirm these variations, and to determine periods. Publication: The Astrophysical Journal Pub Date: August 1988 DOI: 10.1086/166608 Bibcode: 1988ApJ...331..902C Keywords: Companion Stars; Dwarf Stars; Late Stars; Subgiant Stars; Variable Stars; Accretion Disks; Brown Dwarf Stars; Chromosphere; Gravitational Collapse; Line Spectra; Radial Velocity; Velocity Distribution; Astrophysics; PLANETS: GENERAL; RADIAL VELOCITIES; STARS: BINARIES full text sources ADS | data products SIMBAD (16)