Ultra-Short Variability in CH Cygni

Volume 28 number 2 (2000)

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Mario E. Motta

Andrea

Andrea Motta

Abstract

CH Cygni is a star system well known for multiple coexisting variable periods on widely-varying time scales. This paper focuses on a little-known aspect of its variability, on a time scale of several minutes. Data are presented that show CH Cygni varies by 0.15 magnitude over a short time span - 3 to 8 minutes - and this variability is most pronounced in the blue part of the spectrum.