Observation of possible mode switching in three semiregular variable stars

Details Observation of possible mode switching in three semiregular variable stars Observation of possible mode switching in three semiregular variable stars

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991aj....101.1043c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 101, March 1991, p. 1043-1049. Research supported by Research Corp.

Astronomy and Astrophysics

Astronomy

25

Mira Variables, Semiregular Variable Stars, Stellar Oscillations, Astronomical Photometry, Astronomical Spectroscopy, Harmonic Oscillators, Stellar Spectra

Scientific paper

Both the amplitude and period of the light variations of the semiregular long-period variables RV And, S Aql, and U Boo dramaticaly decreased, and then suddenly increased, in recent years. These observations, in conjunction with spectroscopic data, suggest that these stars may have switched from fundamental to overtone pulsation and back again. Theoretical models are consistent with both the photometric and spectroscopic observations. The similarity between the longer-period oscillations of these stars and the behavior of Mira variables supports the conclusion that the Miras are fundamental-mode pulsators.

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