Bi-modal pulsation of the delta Scuti star V1821 Cygni

Details Bi-modal pulsation of the delta Scuti star V1821 Cygni Bi-modal pulsation of the delta Scuti star V1821 Cygni

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...371..233z&link_type=abstract

Astronomy and Astrophysics, v.371, p.233-239 (2001)

Astronomy and Astrophysics

Astrophysics

1

Stars: Delta Scuti Stars, Stars: Oscillations, Stars: Individual: V1821 Cygni

Scientific paper

The results of Johnson V time-series CCD photometry of the delta 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 uvbybeta data in the existing catalogues have been used to derive the main physical parameters for the variable. We obtain: Teff=7490+/- 200 K, MV=1fm02 +/-0.2, log g=3.75+/- 0.1 dex, M=2.3+/-0.2 Msun, R=3.3+/-0.3 Rsun, bar ρ=0.06+/-0.01 bar ρsun, age=1.0+/- 0.1 Gyr and a distance modulus of ~ 9fm 12. V1821 Cyg is suggested to be a Population I delta Scuti star with metal-enriched abundances ([M/H]=0.366) evolving on its late main sequence stage on the basis of the colour indices and derived properties.

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