Other
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...413..349m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 413, no. 1, p. 349-363.
Other
57
Binary Stars, Companion Stars, Radial Velocity, Stellar Mass Ejection, Brown Dwarf Stars, Random Errors, Stellar Luminosity
Scientific paper
At the Mount John University Observatory relative radial velocities of solar-type stars have been obtained with a characteristic random error of 55 m/s using a fiber-fed echelle system and digital cross-correlation techniques. A program of obtaining radial velocities of 29 solar-type stars and 10 giant IAU radial-velocity standard stars was carried out over 2.5 years with a view to the detection of low-mass companions to the dwarf stars. One dwarf star turned out to have a previously undiscovered stellar companion but no dwarfs showed radial-velocity variability suggestive of the presence of substellar companions, although one showed a possible variation. In contrast, at least half the giant or supergiant 'standard' stars were variable in radial velocity. Four and possibly five of the giant standards are probably intrinsic (pulsating) red or yellow variables. Two further standards showed long-period variability suggestive of companions of undetermined mass. The lack of brown dwarfs observed in this program is consistent with the results of other recent surveys.
Clark Michael
Hearnshaw John B.
Murdoch Kaylene A.
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