Issue |
A&A
Volume 374, Number 1, July IV 2001
|
|
---|---|---|
Page(s) | 235 - 242 | |
Section | Interstellar and circumstellar matter | |
DOI | https://doi.org/10.1051/0004-6361:20010722 | |
Published online | 15 July 2001 |
Period and amplitude variations in the high-amplitude δ Scuti star AE Ursae Majoris
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
Received:
28
March
2001
Accepted:
2
May
2001
We present a comprehensive investigation of the variations of period and
amplitude in the high-amplitude δ Scuti star AE UMa based on
our new Johnson V time-series measurements and the existing data.
No additional frequencies were detected even though all the
available data sets from 1974 to 2001 were analysed.
The light variations of AE UMa can be well-reproduced with the
fundamental and first-overtone radial modes and their coupled terms.
New observations and analyses support the most recent results of
Pócs & Szeidl ([CITE]). The fundamental period was essentially
constant over the past 27 years with its standard value of
0086017066 (
cd-1), while the first overtone
period decreased at a rate of
yr-1.
The amplitude variations in the two modes of AE UMa are detected at
the milli-magnitude level on a time-scale of years.
It seems that the amplitudes vary in opposite phases, implying an energy
conservation or some kind of intrinsic variability cause.
We deny the over-interpretation of the period change given by
Hintz et al. ([CITE]) and explore its reason.
Key words: stars: variable: δ Scuti stars / stars: oscillations / stars: individual: AE UMa
© ESO, 2001
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