Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...261..137m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 261, no. 1, p. 137-144.
Astronomy and Astrophysics
Astrophysics
40
Cepheid Variables, Light Curve, Stellar Oscillations, Fourier Analysis, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
New very accurate light curves of 12 Cepheids with P less than 5.5 d are presented. Their Fourier decomposition enabled us to individuate eight other stars which do not follow the Hertzsprung progression. The properties of the Fourier parameters of this subclass, now composed by 28 objects, are consequently better defined. In the phi(21)-P plane 2 stars located on the lower sequence and 2 other stars located on the discontinuity at 3 d were found. All these 28 stars occupy the same region in the R(21)-P plane and the phi(31) values, when available, originate a unique sequence in the phi(31)-P plane. All these loci are well separated from those of the classical Cepheids, which are fundamental mode pulsators. The hypotheses of a first overtone pulsation and of a resonance between this mode and a higher overtone explain the observational facts well.
Mantegazza Luciano
Poretti Ennio
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