Radial-velocity and light variations of IR Cephei

Details Radial-velocity and light variations of IR Cephei Radial-velocity and light variations of IR Cephei

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1123m&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 3, p. 1123-1132.

Astronomy and Astrophysics

Astronomy

Binary Stars, Cepheid Variables, Radial Velocity, B Stars, Light Curve, O Stars, Stellar Spectrophotometry

Scientific paper

Radial-velocity observations of the short-period Cepheid, IR Cephei, have been used to derive a complete radial-velocity versus phase curve for the variable, to investigate the presence of a possible binary companion, and to address the question of its membership in the Cepheus OB2 association. The observations are consistent with the absence of a close binary companion and shed doubt on its membership in the association. Photoelectric observations made with the Phoenix 10 Automated Photometric Telescope confirm the single nature of the star. We present simulations to show the effects of an equiluminous companion on the light curve of a Cepheid, concluding that the light curve of IR Cephei, whether or not it is corrected for a possible companion, exhibits the low-amplitude, sinusoidal variations characteristic of an s-type Cepheid.

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