Power specvtrum analysis
(see Smith, 1974) has been applied to 40 years of AAVSO observations of the red
super-giant variable VX Sgr. The observed light curve can be represented as a
superposition of 660, 750, and 810 day oscillations. Interference of these
three oscillations explains the large range in amplitude discovered by
Dinerstein (1973), though until further observations accumulate this result
must be considered tentative.