Precision of Parabolic Elements

Volume 18 number 1 (1989)

Download this article (pdf)

Emilia P. Belserene
Maria Mitchell Observatory,

Abstract

Formulae are given for a least-square parabola on an O-C diagram, with calculation of the parabolic elements and their mean errors. The formulae are applied to TY Sct, an eleven-day classical Cepheid. The resulting rate or change of period is +0.000032 day per year +-0.000016.