Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.293..393p&link_type=abstract
Astrophysics and Space Science, v. 293, Issue 4, p. 393-413 (2004).
Astronomy and Astrophysics
Astrophysics
2
Pulsating Stars-Classical Cepheids, Light Curve Shape Variability, Data Analysis
Scientific paper
A variability survey on the shape of the light curve of the classical Cepheid DL Cas has been performed on the basis of Johnson V photometry data covering about 38 years. The input parameters (mean magnitude, pulsation frequency and period, light curve amplitude, harmonics amplitudes, Fourier type structural parameters) for our study were determined through the Fourier decomposition technique applied to each data set. The analysis of the outcoming time series, using different and complementary methods, seems to indicate the constancy of these parameters within the precision limits of the available data, although the hypothesis of the presence of a low level variability cannot be excluded. The only exception is the pulsation period, which displays a possible increasing trend with a rate of 0.109 ± 0.037 s yr-1. This trend may be, at least partly, an effect of the unequal precision of pulsation period estimated values, corresponding to each considered data set.
Codreanu Steliana
Pop Alexandru
Turcu Vlad
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