Limits on mode identifications in rotating, non-radially pulsating stars.
Abstract
We present CLEAN time-series analysis of synthetic line profiles obtained from a non-radially pulsating stellar model which incorporates effects of rotation. Two models (a low-degree l = 2, m = -1; and a high degree l = -m = 8) were calculated for a rapidly rotating late O-type star, where the prograde oscillation frequency in the corotating frame of the star is twice that of the stellar rotation frequency. An interpretation of the results based upon the usual slow-rotation assumptions gives a mis-identification of both period and mode of oscillation for the low-degree model, but correctly identifies the non-radial pulsation (NRP) characteristics of the sectorial model. The mis-identification of the low-degree model has possible implications for previous mode identifications, and we urge caution when analyzing the line profile variations of rapidly-rotating, non-radially pulsating stars.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1993
- Bibcode:
- 1993A&A...279L..25R
- Keywords:
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- Astronomical Models;
- Fourier Analysis;
- Line Spectra;
- Mathematical Models;
- O Stars;
- Stellar Models;
- Stellar Oscillations;
- Stellar Rotation;
- Time Series Analysis;
- Amplitudes;
- Modes;
- Phase Shift;
- Astrophysics