Radial pulsation in variable stars with mass loss

Details Radial pulsation in variable stars with mass loss Radial pulsation in variable stars with mass loss

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..471p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 2, p. 471-489.

Computer Science

Sound

10

Giant Stars, Stellar Mass Ejection, Stellar Winds, Variable Stars, Boundary Conditions, Mathematical Models, Sound Waves, Wave Propagation

Scientific paper

A criterion is derived for determining when the dynamic background must be included in the calculation of stellar pulsation in cool giant stars (long period variables) and in supergiants. The new boundary conditions are discussed for stars with a significant mass loss, and it is shown that these give rise to a new class of wave modes, consisting of damped, radially expanding waves. These waves can transfer the excess energy into the wind where it can be dissipated through radiative shocks. The values of the pulsation constant Q belonging to these modes are different from the classical Q values and may explain the discrepancy between observations and classical pulsation theory.

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