A Precision Velocity Study of Photometrically Stable Stars in the Cepheid Instability Strip

Details A Precision Velocity Study of Photometrically Stable Stars in the Cepheid Instability Strip A Precision Velocity Study of Photometrically Stable Stars in the Cepheid Instability Strip

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...494..342b&link_type=abstract

Astrophysical Journal v.494, p.342

Astronomy and Astrophysics

Astronomy

11

Stars: Binaries: Spectroscopic, Stars: Variables: Cepheids, Stars: Oscillations, Techniques: Radial Velocities

Scientific paper

Results of a precision Doppler velocity survey of 15 stars that lie in or near the Cepheid instability strip are presented. Previous studies have shown that these stars are photometrically stable. Long-term radial velocity precision of 15 m s-1 has been achieved with the use of an iodine absorption cell and a high-resolution cross-dispersed echelle spectrometer. The stars show a variety of behavior from stability (at the level of 30 m s-1) to variability from 50 m s-1 to a few km s-1. Periodograms of many of the program stars show significant peaks at 50-80 days that are not associated with radial pulsation. Previously undetected binary companions have been found around two of the stars. Line profiles are compared to delta Cep.

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