Statistical Period Analysis of Mira Type Variables (Abstract)

Volume 35 number 1 (2007)

H. Sato

K. Saijo

K. Yoshioka

J. A. Mattei

Abstract

(Abstract only) To investigate irregular variations in brightness and in period change of long period variable stars (LPVs), we made statistical studies of period variations of such stars, based on two- and three-dimensional return maps and smoothed diagrams using spline curves on the period variations of these stars.