Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...169..122a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 169, no. 1-2, Nov. 1986, p. 122-132.
Astronomy and Astrophysics
Astrophysics
45
Cepheid Variables, Dwarf Stars, Fourier Analysis, Light Curve, Stellar Structure, Blue Stars, Hertzsprung-Russell Diagram, Stellar Oscillations
Scientific paper
The light curves of monoperiodic, high amplitude δ Scuti and SX Phe stars have been Fourier decomposed in order to study their structural properties. The computed phase differences show a trend to increase with the period similar to the trend observed in short period Cepheids and RR Lyrae stars. There is some evidence of a separation of the light curves in two groups, which indicates the presence of two types of pulsation. The proposed separation is discussed taking also into account the amplitude-amplitude diagrams, and some comparisons with RR Lyrae star light curves are made. For the present there are no evident physical differences between the stars in the two groups which can explain the separation.
Antonello Elio
Broglia Pietro
Conconi Paolo
Mantegazza Luciano
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