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, email@example.com
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