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Title:
A planetary system for Gamma Cephei?
Authors:
Lawton, A. T.; Wright, P.
Publication:
British Interplanetary Society, Journal (ISSN 0007-084X), vol. 42, July 1989, p. 335, 336.
Publication Date:
07/1989
Category:
Astrophysics; Planets
Origin:
STI
NASA/STI Keywords:
Cepheus Constellation, Extrasolar Planets, Planetary Systems, Stellar Motions, Radial Velocity, Sun, Velocity Measurement
Keywords:
PLANETS, POPULAR, DIAGRAMS, LUMINOSITY, MASS, ASTRONOMY, EQUIPMENT, SIZE, THEORETICAL STUDIES, ORBITS, DISTANCE, TEMPERATURE, COMPARISONS, RADIAL VELOCITY
Bibliographic Code:
1989JBIS...42..335L

Abstract

Gamma Cephei, an orange-yellow star with a visual magnitude of +3.2, is studied. Its absolute magnitude is 2.2, compared with 4.84 for the sun; the star is 11.5 times brighter than the sun and has a mass twice as great. It is believed that the systematic cyclic variations of radial velocity with periods longer than 5 yrs imply companion masses of 1.5-2.0 x Jupiter, namely, planetary masses.
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