Fourier analysis of the light curves of eclipsing variables, XX

The application of Fourier decomposition parameters has revolutionized important areas of investigations of Cepheid type variables since the introduction of Fourier analysis in its modern form by Simon and Lee (1981).In the literature several different representations of the results of Fourier analysis have been utilized. In view of the growing interest for applications of Fourier decomposition it is important to use and publish Fourier data in an optimal way. Most studies until now have used amplitude ratios and phase differences derived from traditional light curves giving the light variation in magnitudes, following the original recipe of Simon and Lee (1981). However, Stellingwerf and Donohoe (1986) advocated the use of phases rather than phase differences. Recently, Buchler et al. (1990) argued that the standard Simon & Lee form contains all relevant physics, and suggested analysis of flux-values rather than of magnitudes, because this removes the distorting effects of constant, false light. Thus there are many choices to be made in practical applications of Fourier analysis, and there is at present no convincing argument for preferring one specific representation.

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Photometric and Radial Velocity Variations of R CrB Near Maximum Light

International Astronomical Union Colloquium ◽

10.1017/s0252921100090758 ◽

1985 ◽

Vol 87 ◽

pp. 191-197

Author(s):

A.V. Raveendran ◽

B.N. Ashoka ◽

N. Kameswara Rao

Keyword(s):

Fourier Analysis ◽

Radial Velocity ◽

Radial Velocities ◽

Light Curves ◽

Circumstellar Dust ◽

Maximum Light ◽

V Band ◽

L Band ◽

Velocity Variations ◽

Visual Light

Abstract:Fourier analysis of the light curves of RCrB in V band near maximum shows that in addition to several significant short periods there is a modulation of the visual light with a period around 1170 day, similar to that of L band flux, noticed by strecker. This indicates that there is some contribution to the visual light variations of the star from the pulsating circumstellar dust. Radial velocities of R CrB obtained at Kavalur during February-May 1985 show variations with a period around 47 days.

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