Resonant Excitation of Nonradial Modes in RR Lyr Stars
| dc.creator | Nowakowski, Rafal M. | |
| dc.creator | Dziembowski, Wojciech A. | |
| dc.date | 2001-05-09 | |
| dc.date.accessioned | 2026-07-07T01:58:23Z | |
| dc.date.available | 2026-07-07T01:58:23Z | |
| dc.description | We study a nonlinear development of radial pulsation instability to a resonant excitation of nonradial modes. Our theory covers the cases of axisymmetric (m=0) modes as well as (m,-m) pairs. Adopting a simplified treatment of the radial and nonradial mode coupling we find that the asymptotic state is a pulsation with constant amplitudes and we evaluate the relative amplitude of the nonradial component. Observable consequence of the m=0 mode excitation is a small period change and a more significant amplitude change, especially in the case of a dipole mode (l=1). Such a mode has a fairly large excitation probability. Significant amplitude and phase modulation is predicted in the case of excitation of a m=1,-1 pair. We suggest that this may explain Blazhko-type modulation in RR Lyr stars. If this model is correct, the modulation period is determined by the rotation rate and the Brunt-Vaisala frequency in the deepest part of the radiative interior. | |
| dc.description | 42 pages, 10 figures, published in Acta Astronomica | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0105141 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0105141 | |
| dc.identifier | Acta Astronomica, Vol 51, 2001, p.5 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/2752 | |
| dc.subject | Astrophysics | |
| dc.title | Resonant Excitation of Nonradial Modes in RR Lyr Stars | |
| dc.type | text |