| Issue |
A&A
Volume 371, Number 1, May III 2001
|
|
|---|---|---|
| Page(s) | 233 - 239 | |
| Section | Interstellar and circumstellar matter | |
| DOI | https://doi.org/10.1051/0004-6361:20010375 | |
| Published online | 15 May 2001 | |
Bi-modal pulsation of the δ Scuti star V1821 Cygni
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
Corresponding author: A.-Y. Zhou, aiying@bao.ac.cn
Received:
8
January
2001
Accepted:
15
March
2001
The results of Johnson V time-series CCD photometry of
the δ Scuti star V1821 Cygni are presented.
Our data set consists of 2431 differential magnitudes and spans the period
of July 1999 to September 2000.
We detect two best-fit pulsation frequencies representing the light
variations of the variable. V1821 Cyg is most likely pulsating in
a mixture of radial and nonradial modes.
The 
data in the existing catalogues have been used to derive
the main physical parameters for the variable. We obtain:
K, 
,
dex, 
,
,
, 
Gyr and
a distance modulus of ~
12.
V1821 Cyg is suggested to be a Population I δ Scuti star
with metal-enriched abundances (
) evolving on its late
main sequence stage on the basis of the colour indices and derived
properties.
Key words: stars: δ Scuti stars / stars: oscillations / stars: individual: V1821 Cygni
© ESO, 2001
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