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Pulsation Time Scales and Amplitudes in a Sample of Bright Semi-Regular Variable Stars

V. Cristina Cristian, Robert A. Donahue, Willie H. Soon, Sallie L. Baliunas and Gregory W. Henry
Publications of the Astronomical Society of the Pacific
Vol. 107, No. 711 (1995 May), pp. 411-415
Stable URL: http://www.jstor.org/stable/40680553
Page Count: 5
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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.
Pulsation Time Scales and Amplitudes in a Sample of Bright Semi-Regular Variable Stars
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Abstract

We have analyzed the differential V-band photometric variations of records up to 8 years long in ten M III semi-regular variable stars. Periodograms constructed from each star's entire record and seasonal intervals were used to find repetitive occurrences of pulsation periods in the range of 10 to 250 days. For every star at least one locus of periods was observed, with many stars showing two distinct distributions of pulsation time scales. The observed pulsation periods and differential V-magnitude semi-amplitudes appear to be correlated such that longer periods correspond to larger semi-amplitudes.

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