Document Type
Article
Publication Date
9-1993
Department 1
Physics
Abstract
Radical-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.
Copyright Note
This is the publisher’s version of the work. This publication appears in Gettysburg College’s institutional repository by permission of the copyright for personal use, not for redistribution.
Recommended Citation
Marschall, Laurence, and Michael A. Seeds and Robert J. Davis. "Radial-Velocity and Light Variations of IR Cephei." The Astronomical Journal (September 1993) 106(3):1123-1132.
Required Publisher's Statement
Original version available from the publisher at: http://iopscience.iop.org/1538-3881