The pulsations of yellow semiregular variables. I - Double-mode behaviour of UU Herculis

Details The pulsations of yellow semiregular variables. I - Double-mode behaviour of UU Herculis The pulsations of yellow semiregular variables. I - Double-mode behaviour of UU Herculis

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...256..107z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 256, no. 1, p. 107-112.

Astronomy and Astrophysics

Astrophysics

16

Light Curve, Stellar Models, Stellar Oscillations, Variable Stars, Amplitude Distribution Analysis, Electrophotometry, Vibration Mode

Scientific paper

Long series of visual and photoelectric observations of UU Her since 1908 has been analyzed. It is shown that UU Her is a double-mode semiregular variable, the two excited modes of pulsation are probably the fundamental and the first overtone. A simple model is presented to explain the amplitude variations observed in both modes. The model which assumes pure sinusoidal amplitude variation is quite successful in explaining the power spectrum of the variable. The question of the mass of UU Her is also discussed. It is argued that no observation of the star so far points unambiguously to its having a low mass.

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