Spectroscopic Determination of Radius Changes of Cepheid Variable Stars

Details Spectroscopic Determination of Radius Changes of Cepheid Variable Stars Spectroscopic Determination of Radius Changes of Cepheid Variable Stars

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasp..119..398g&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 119, Issue 854, pp. 398-406.

Astronomy and Astrophysics

Astronomy

5

Stars: Distances, Stars: Oscillations, Stars: Rotation, Techniques: Spectroscopic

Scientific paper

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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