Another Look at the Period of HS Aquilae

Volume 20 number 1 (1991)

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Lisa Wenner

Maria Mitchell Observatory, Nantucket, MA 02554

Abstract

An examination of the Mira variable HS Aquilae using recent Maria Mitchell Observatory plates reveals that the period has become shorter than the 267-day period given by Harwood in 1962. A constantly decreasing period is favored over an abrupt change. The rate of change is approximately -0.17 +_ 0.01 day per year.