Other
Scientific paper
Mar 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.294..622s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 294, p. 622
Other
31
Stellar Oscillations, Variable Stars, Stellar Models, Massive Stars
Scientific paper
Properties of the so-called strange modes occurring in linear stability calculations of stellar models are discussed. The behavior of these modes is compared for two different sets of stellar models, for very massive zero-age main-sequence stars and for luminous hydrogen-deficient stars, both with high luminosity-to-mass ratios. We have found that the peculiar behavior of the frequencies of the strange modes with the change of a control parameter is caused by the pulsation amplitude of a particular eigenmode being strongly confined to the outer part of the envelope, around the density inversion zone. The frequency of a strange mode changes because the depth of the confinement zone changes with the control parameter. Weakly nonadiabatic strange modes tend to be overstable because the amplitude confinement quenches the effect of radiative damping. On the other hand, extremely nonadiabatic strange modes become overstable because the perturbation of radiation force (gradient of radiation pressure) provides a restoring force that can be out of phase with the density perturbation. We discuss this mechanism by using a plane-parallel two-zone model.
Baker Norman H.
Gautschy Alfred
Saio Hideyuki
No associations
LandOfFree
On the properties of strange modes does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with On the properties of strange modes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the properties of strange modes will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-958602