Gamma Cephei - Rotation or planetary companion?

Details Gamma Cephei - Rotation or planetary companion? Gamma Cephei - Rotation or planetary companion?

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396l..91w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 396, no. 2, Sept. 10, 1992, p. L91-L94. Research supported by NSE

Astronomy and Astrophysics

Astrophysics

37

Binary Stars, Companion Stars, Radial Velocity, Stellar Rotation, Variable Stars, Chromosphere, Extrasolar Planets, G Stars, Rotational Spectra, Stellar Activity, Stellar Spectra

Scientific paper

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.

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