Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1170..512s&link_type=abstract
STELLAR PULSATION: CHALLENGES FOR THEORY AND OBSERVATION: Proceedings of the International Conference. AIP Conference Proceedin
Other
Pulsations, Oscillations, And Stellar Seismology, Gravitational Radiation, Magnetic Fields, And Other Observations, Cepheids
Scientific paper
We have modeled the pulsations of HR 1217 (HD 24712), one of the best observed roAp (rapidly oscillating Ap) stars, by taking into account the nonadiabatic effect of radiation as well as the effect of the magnetic field assuming dipole fields. Since the observed frequencies are all above the critical frequencies of our models, a running wave outer boundary condition was imposed.
All the oscillation modes examined for the observed frequency range are found to be damped; i.e, the κ-mechanism excitation in the hydrogen-ionization zone is not strong enough. We probably need a new mechanism to excite p-modes in the cool roAp star HR 1217. The main pulsation frequency (2.721 mHz) is matched with a quasi-quadrapole mode (lm = 2, where lm is defined as effective latitudinal degree), and the highest frequency (2.806 mHz) obtained in a WET campaign is matched with an lm = 3 mode. Theoretical predictions for the distribution of the pulsation amplitudes and phases with respect to the optical depth agree reasonably with the results of spectroscopic analyses. We also show that the theoretical amplitude modulations with rotation phase agree qualitatively with the observed modulation.
Ryabchikova Tanya
Sachkov Mikhail
Saio Hideyuki
No associations
LandOfFree
Modelling the Pulsations of the roAp Star HR 1217 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 Modelling the Pulsations of the roAp Star HR 1217, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modelling the Pulsations of the roAp Star HR 1217 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1272062