| |
 |
| Paper: |
Amplitude Variability of Delta Scuti Stars: 4 CVn |
| Volume: |
203, The Impact of Large-Scale Surveys on Pulsating Star Research, IAU Colloquium 176 |
| Page: |
421 |
| Authors: |
Breger, M. |
| Abstract: |
The amplitude variability of δ Scuti stars is demonstrated by the behavior of the evolved δ Scuti star 4 CVn. The data on 4 CVn covering over 30 yr shows the amplitudes of almost all modes to be extremely variable with a time scales of ten years or longer. The most rapid decrease of amplitude in V is shown by the 7.38 d-1 mode of 4 CVn, which collapsed from 15 mmag in 1974 to 4 mmag in 1976, and 1 mmag in 1977. Between 1974-6 and 1977-8 phase jumps of almost half a cycle occurred. While a simple beating model of two close frequencies can be ruled out from the photometric data, the change is compatible with the growth of a new mode between 1976 and 1977. |
|
|
|
|
|
