Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..52..213t&link_type=abstract
Astrophysics and Space Science, vol. 52, no. 1, Nov. 1977, p. 213-235.
Astronomy and Astrophysics
Astrophysics
7
Eclipsing Binary Stars, Light Curve, Orbit Calculation, Graphs (Charts), Limb Darkening, Orbital Elements, Photoelectric Effect, Stellar Mass
Scientific paper
An attempt has been made to bring photoelectric and dynamical properties of the AR Lac system to a common focus. The photoelectric properties are illustrated by a series of light curves in the blue and infrared produced from a series of observations made by Kron et al. from 1938 to 1948. An analysis of these reveals a decrease in the period of the order of 0.00001. A Fourier analysis of the light curves is employed to estimate the elements for the period represented by each curve. These results suggest a variation of the fractional radii over an eight-month period. Dynamical effects are ruled out, and the result is seen to be the outcome of some photoelectric effect. A phenomenological discussion of the nature of these photoelectric effects is presented, showing that their origin may be in gas streams rather than spot effects.
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