Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90...18w&link_type=abstract
Astronomy and Astrophysics, vol. 90, no. 1-2, Oct. 1980, p. 18-25. Research supported by the Oesterreichisher Fonds zur Foerder
Astronomy and Astrophysics
Astrophysics
15
A Stars, Periodic Variations, Stellar Rotation, Variable Stars, Power Spectra, Stellar Oscillations, Stellar Spectrophotometry
Scientific paper
A period of 0.9178 d for 21 Com (HD 108945) is calculated which fits the previous data for long (rotational) periods, and all available photometric and spectroscopic data of 21 Com are reanalyzed in an attempt to clarify the long and short (pulsational) periods. The results suggest that the short-time-scale variations are changing amplitude; only one frequency for the short-time-scale variations is found. This disagrees with the idea of the simultaneous presence of two frequencies as proposed by Percy (1975). The effectiveness of classical period calculation techniques to determine two frequencies which are simultaneously present in a short data set is also discussed.
Breger Michel
Rakosch K. D.
Weiss Walter
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