A&A 371, 233-239 (2001)
Bi-modal pulsation of the Scuti star V1821 CygniA.-Y. Zhou, Z.-L. Liu and B.-T. Du
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
(Received 8 January 2001 / Accepted 15 March 2001)
The results of Johnson V time-series CCD photometry of the 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 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: Scuti stars -- stars: oscillations -- stars: individual: V1821 Cygni
Offprint request: A.-Y. Zhou, firstname.lastname@example.org
© ESO 2001