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The Semiregular Variable FS Comae—Evidence for Radial Oscillations

Guillermo Torres, Tsevi Mazeh, David W. Latham and Robert P. Stefanik
Publications of the Astronomical Society of the Pacific
Vol. 105, No. 686 (1993 April), pp. 360-366
Stable URL: http://www.jstor.org/stable/40680038
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Semiregular Variable FS Comae—Evidence for Radial Oscillations
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Abstract

We present newly obtained radial-velocity measurements of the semiregular variable FS Comae, together with available photoelectric data and visual brightness estimates. Both the light variations in the V band and the radial velocities show a similar periodicity of about 55 days, with a phase lag of approximately 40 days between the two. These observations strongly suggest radial pulsation as the mechanism driving the variations. There is evidence that both the photometric period and the spectroscopie period are variable over long time scales.

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