Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...285..524p&link_type=abstract
Astronomy and Astrophysics 285, 524-530 (1994)
Astronomy and Astrophysics
Astrophysics
25
Methods: Data Analysis, Stars: Oscillations, Cepheids
Scientific paper
In this paper the Fourier decomposition was applied to photoelectric and CCD measurements of faint Cepheids for which the light curve was supplied for the first time with a sufficient accuracy. The Fourier decomposition is confirmed to be a pulsation mode discriminator and this property is discussed by considering also the case of the double-mode Cepheid TU Cas. The analysis allowed us to detect three new first overtone pulsators and to better define the behaviour of the Hertzsprung progression for classical Cepheids with P<3 d. Some uncertainties are left only for Cepheids located exactly on the discontinuity at P =~3 d and for Cepheids with an apparently perfect sinusoidal light curve. At the present time, the Fourier decomposition cannot be used to discriminate safely between Pop. I and Pop. II stars. However, more numerous and precise measurements should allow us to clarify also these open questions.
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