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Title:
Spectroscopic Determination of Radius Changes of Cepheid Variable Stars
Authors:
Gray, David F.; Stevenson, Kevin B.
Affiliation:
AA(Department of Physics and Astronomy, University of Western Ontario, London, ON, Canada; , ), AB(Department of Physics and Astronomy, University of Western Ontario, London, ON, Canada; , )
Publication:
The Publications of the Astronomical Society of the Pacific, Volume 119, Issue 854, pp. 398-406. (PASP Homepage)
Publication Date:
04/2007
Origin:
UCP
PASP Keywords:
Stars: Distances, Stars: Oscillations, Stars: Rotation, Techniques: Spectroscopic
DOI:
10.1086/518128
Bibliographic Code:
2007PASP..119..398G

Abstract

We introduce a simple method for determining pulsation velocities of Cepheid variables; namely, the matching of observed spectral line profiles in both shape and absolute position with model profiles. This approach avoids the ambiguous meaning of radial velocity for asymmetric lines, and it avoids the awkward projection factor (the ``p'' factor) used to expand radial velocities to pulsation velocities. In this investigation, we employ a simple pure-geometry model that reproduces all the major features in the observations. We illustrate the method using spectroscopic observations of ζ Gem, η Aql, and δ Cep taken at the Elginfield Observatory, and derive the absolute radius changes.
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Physics
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