Visual and Photoelectric Observations of DM Persei

Volume 20 number 1 (1991)

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David B. Williams

8270-A Racquetball Way, Indianapolis, IN 46260

Abstract

A light curve of the Algol-type eclipsing variable DM Persei formed from 256 visual estimates, supported by a photoelectrically determined time of minimum, indicates that the light elements of Scaltriti (1976) are reliable. A comparison between visual and photoelectric timings of minima indicates routine visual timings are prone to large errors when long, shallow eclipses are observed.