Limits on mode identifications in rotating, nonradially pulsating stars.
Abstract
We present CLEAN timeseries analysis of synthetic line profiles obtained from a nonradially pulsating stellar model which incorporates effects of rotation. Two models (a lowdegree l = 2, m = 1; and a high degree l = m = 8) were calculated for a rapidly rotating late Otype 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 slowrotation assumptions gives a misidentification of both period and mode of oscillation for the lowdegree model, but correctly identifies the nonradial pulsation (NRP) characteristics of the sectorial model. The misidentification of the lowdegree model has possible implications for previous mode identifications, and we urge caution when analyzing the line profile variations of rapidlyrotating, nonradially pulsating stars.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 November 1993
 Bibcode:
 1993A&A...279L..25R
 Keywords:

 Astronomical Models;
 Fourier Analysis;
 Line Spectra;
 Mathematical Models;
 O Stars;
 Stellar Models;
 Stellar Oscillations;
 Stellar Rotation;
 Time Series Analysis;
 Amplitudes;
 Modes;
 Phase Shift;
 Astrophysics