Abstract
view Abstract Citations (60) References (10) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Gamma Cephei: Rotation or Planetary Companion? Walker, Gordon A. H. ; Bohlender, David A. ; Walker, Andrew R. ; Irwin, Alan W. ; Yang, Stephenson L. S. ; Larson, Ana Abstract In 1988 Gamma Cep was reported as a single-line, long-period spectroscopic binary with short-term periodic (P = 2.7 yr) residuals which might be caused by a Jupiter-mass companion. Eleven years of data now give a 2.52 yr (K = 27 m/s) period and an indeterminate spectroscopic binary period of not less than 30 yr. While binary motion induced by a Jupiter-mass companion could still explain the periodic residuals, Gamma Cep is almost certainly a velocity variable yellow giant because both the spetrum and (R - I) color indices are typical of luminosity class III. T eff and the trigonometric parallax give 5.8 solar radii independently. Publication: The Astrophysical Journal Pub Date: September 1992 DOI: 10.1086/186524 Bibcode: 1992ApJ...396L..91W Keywords: Binary Stars; Companion Stars; Radial Velocity; Stellar Rotation; Variable Stars; Chromosphere; Extrasolar Planets; G Stars; Rotational Spectra; Stellar Activity; Stellar Spectra; Astrophysics; PLANETS AND SATELLITES: GENERAL; STARS: BINARIES: SPECTROSCOPIC; STARS: CHROMOSPHERES; STARS: ROTATION; STARS: VARIABLES: OTHER MISCELLANEOUS full text sources ADS | data products SIMBAD (5)
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