Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-10-22
Astronomy and Astrophysics
Astrophysics
5 pages, 3 figures, ApJ (in press)
Scientific paper
10.1086/340550
Near the edges of the instability strip the rate of stellar evolution is larger than the growth-rate of the pulsation amplitude, and the same holds whenever the star is engaged in pulsational mode switching. Stellar evolution therefore controls both the onset of pulsation at the edges of the instability strip and of mode switching inside it. Two types of switchings (bifurcations) occur. In a soft bifurcation the switching time scale is the inverse harmonic mean of the pulsational modal growth-rate and of the stellar evolution rate. In a hard bifurcation the switching times can be substantially longer than the thermal time scale which is typically of the order of a hundred periods for Cepheids and RR Lyrae. We discuss some of the observational consequences, in particular the paucity of low amplitude pulsators at the edges of the instability strip.
Buchler Jean-Robert
Kolláth Zoltan
No associations
LandOfFree
Mode Switching Time Scales in the Classical Variable Stars 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 Mode Switching Time Scales in the Classical Variable Stars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mode Switching Time Scales in the Classical Variable Stars will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-232950