VX Hydrae: Observation of a Sudden Change in a Pulsating Star

Volume 39 number 1 (2011)

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Michel Bonnardeau

116 Jonquille Arzelier, 38650 Chateau-Bernard, France; arzelier1@free.fr

Shawn Dvorak

Rolling Hills Observatory, 1643 Nightfall Drive, Clermont, FL 34711; sdvorak@cfl.rr.com

Rudy Poklar

14084 N. Willow Bend Drive, Tucson, AZ 85737; rfpoklar@aol.com

Gerard Samolyk

P.O. Box 20677; Greenfield, WI 53220; gsamolyk@wi.rr.com

Abstract

Time-series of VX Hya from March 2005 to April 2010 are analyzed. A period jump is discovered to happen in 2008 in all the pulsation modes, being at its strongest for the overtone.