A Revision of the Variable Period of IM Aquilae

Volume 20 number 1 (1991)

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Dana Lehr

Maria Mitchell Observatory, Nantucket, MA 02554

Abstract

Previously published elements for the RR Lyrae variable IM Aquilae are revised with the addition of observations from the Maria Mitchell Observatory plate collection from 1981 through 1990. The following parabolic elements provide a good approximation of the decreasing period: JD_max = 2439806.597 + 0.45694896 E - 1.91 x 10^-10 E^2.