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Astron. Astrophys. 321, 145-150 (1997)

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8. About energy transfer

Fitch (1969) and Paper I propose, in opposition to Garrido (1983), that there is a coupling between the orbital period and the three pulsation frequencies. It has been shown also that there is no energy transfer between these three pulsation modes (Chapellier,1986), when their amplitudes vary. This is especially evident in the [FORMULA] amplitude variations that occurred in 1951 - a factor 10 in two weeks -, as no correlated contemporaneous energy transfer appeared in [FORMULA] and/or [FORMULA]. Here, in 1987 and 1992, we obtain

Energy = [FORMULA] = 17.5 and 13.7 (mmag) respectively (or 35 and 27.5 mmag, according to Chapellier's notation based on the light variation ranges). E being proportional to the total energy available in the short periods of amplitudes [FORMULA]. So, in the visible and near UV part of the spectrum, the total energy output involved in the star short period variations does vary.

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© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998