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| Paper: |
Mode lifetimes and transient modes in rapidly oscillating AP stars |
| Volume: |
11, Confrontation Between Stellar Pulsation and Evolution |
| Page: |
275 |
| Authors: |
Kurtz, D. W. |
| Abstract: |
Four rapidly oscillating Ap stars, HD 6532, HD 60435, HD 203932 and HD 217522, show transient frequencies. Both HD 60435 and HD 217522 have been seen to have a 4.18-mHz frequency for several days. HD 60435 had a 1.1-mHz frequency at the same time it had the 4.18-mHz frequency. HD 217522 had an 0.8-mHz frequency at the same time it had the 4.18-mHz frequency. These frequencies are not seen in many other nights of observation. HD 217522 shows other evidence of aperiodic changes in the amplitudes of its pulsation frequencies. HD 6532 pulsates principally in an oblique dipole mode with a frequency of 2.40 mHz; on two nights it showed a frequency of 1.17 mHz which was not seen again on 30 subsequent nights. HD 203932 pulsates principally with a frequency of 2.805 mHz; other frequencies in its amplitude spectra depend on the data set analyzed, indicating transient frequencies. |
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