Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...284..278s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 284, Sept. 1, 1984, p. 278-281.
Astronomy and Astrophysics
Astrophysics
17
Cepheid Variables, Light Curve, Phase Shift, Stellar Oscillations, Fourier Analysis, Radial Velocity
Scientific paper
The first-order phase lag between light and velocity is calculated from Fourier decompositions of the variations of 12 classical Cepheids. The phase lags have a narrow range, with maximum expansion velocity always retarded with respect to maximum light. The average value of the first-order phase lag is found to be approximately -0.3, close to the theoretical value obtained from the models of Simon and Davis. When the phase lag is plotted against period, two of the stars stand out. These stars are SU Cas and AZ Cen, both suspected overtone pulsators. AZ Cen is further investigated by combining the light curves of three observers and plotting the star on the phi(21)-period diagram of Simon and Lee. The tentative result is seen to strengthen both the identification of AZ Cen as an overtone pulsator and the possible role of the first-order phase lag as a discriminator of mode. The results and the uncertainties which remain are discussed.
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