Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Refereed Journal Article (PDF/Postscript)
· Full Refereed Scanned Article (GIF)
· References in the article
· Citations to the Article (168) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (16)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
A search for substellar companions to solar-type stars
Authors:
Campbell, Bruce; Walker, G. A. H.; Yang, S.
Affiliation:
AA(Victoria, University; Dominion Astrophysical Observatory, Victoria, Canada), AB(British Columbia, University, Vancouver, Canada), AC(British Columbia, University, Vancouver, Canada)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 331, Aug. 15, 1988, p. 902-921. Research supported by the National Research Council of Canada, Canada Employment and Immigration Commission, and NSERC. (ApJ Homepage)
Publication Date:
08/1988
Category:
Astrophysics
Origin:
STI
NASA/STI 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
DOI:
10.1086/166608
Bibliographic Code:
1988ApJ...331..902C

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.

Printing Options

Print whole paper
Print Page(s) through

Return 600 dpi PDF to Acrobat/Browser. Different resolutions (200 or 600 dpi), formats (Postscript, PDF, etc), page sizes (US Letter, European A4, etc), and compression (gzip,compress,none) can be set through the Printing Preferences


More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
  New!

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints