| Issue |
A&A
Volume 497, Number 2, April II 2009
|
|
|---|---|---|
| Page(s) | 481 - 485 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361/200810512 | |
| Published online | 05 March 2009 | |
Research Note
Five colour photometry of the RRd star V372 Serpentis*
Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary e-mail: [benko;barcza]@konkoly.hu
Received:
3
July
2008
Accepted:
30
January
2009
Aims. The first U-band and new 
photometry of the RRd star V372 Ser is presented to determine some parameters of the star.
Methods. In April, May 2007, 2812 
frames were obtained at Konkoly and Teide Observatories and 1508 V observations were collected from the literature. Fourier fitted light curves were derived in all bands.
Results. The non-linearly coupled frequencies -1,
-1, i.e. periods 
days, 
d, 
, amplitudes 
mag, 
mag, and phases have been found. 
has been found from averaging the amplitude ratio in the different bands i.e. the first overtone is the dominant pulsation mode. From the V observations, upper limits are given for secular change of the Fourier parameters. The period ratio and period put V372 Ser among the RRd stars of the globular clusters M3 and IC 4499; mass, luminosity, and metallicity estimates are given.
Key words: stars: variables: RR Lyr / stars: fundamental parameters / stars: individual: V372 Serpentis
© ESO, 2009
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