| Issue |
A&A
Volume 393, Number 2, October II 2002
|
|
|---|---|---|
| Page(s) | 555 - 561 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20021081 | |
| Published online | 23 September 2002 | |
Long term behaviour of the double-mode high-amplitude δ Scuti star RV Arietis *
Konkoly Observatory of the Hungarian Academy of Sciences, 1525 Budapest, PO Box 67, Hungary
Corresponding author: B. Szeidl, szeidl@konkoly.hu
Received:
30
April
2002
Accepted:
10
July
2002
Stability of both the fundamental and first overtone oscillations
of RV Ari was investigated by different methods which led to concordant
results. The fundamental period of RV Ari has been decreasing very slowly
with a rate of 
while the first overtone period has been increasing a little faster with a
rate of 
,
if we assume linear period changes over the past 65 years. Although the very
slow change in the periods is consistent with the evolutionary theories, the
fact that the signs of the period changes for the two modes are opposite
indicates that the dominating part of the period variation may be the result
of non-evolutionary effects. The amplitudes of the fundamental and overtone
oscillations have undergone small changes (several mmag) on a time scale of
years, and a slight increase in the amplitude of the first overtone pulsation
is suspected. An additional frequency at 
cd-1 is found.
Key words: stars: oscillations / stars: variables: δ Sct / stars: individual: RV Ari
© ESO, 2002
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