Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-09-13
Astronomy and Astrophysics
Astrophysics
8 pages, 7 figures, 1 table. (accepted for publication in A&A)
Scientific paper
10.1051/0004-6361:20077647
In the present work, the effect of near-degeneracy on rotational Petersen diagrams (RPD) is analysed. Seismic models are computed considering rotation effects on both equilibrium models and adiabatic oscillation frequencies (including second-order near-degeneracy effects). Contamination of coupled modes and coupling strength on the first radial modes are studied in detail. Analysis of relative intrinsic amplitudes of near-degenerate modes reveals that the identity of the fundamental radial mode and its coupled quadrupole pair are almost unaltered once near-degeneracy effects are considered. However, for the first overtone, a mixed radial/quadrupole identity is always predicted. The effect of near-degeneracy on the oscillation frequencies becomes critical for rotational velocities larger than 15-20 km/s, for which large wriggles in the evolution of the period ratios are obtained (up $10^{-2}$). Such wriggles imply uncertainties, in terms of metallicity determinations using RPD, reaching up to 0.50 dex, which can be critical for Pop. I HADS (High Amplitude \dss). In terms of mass determinations, uncertainties reaching up to 0.5 M_sun are predicted. The location of such wriggles is found to be independent of metallicity and rotational velocity, and governed mainly by the avoided-crossing phenomenon.
Garrido Rafa
Moya Andres
Suarez Juan Carlos
No associations
LandOfFree
The role of rotation on Petersen Diagrams. II The influence of near-degeneracy 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 The role of rotation on Petersen Diagrams. II The influence of near-degeneracy, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The role of rotation on Petersen Diagrams. II The influence of near-degeneracy will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-214564