Precision of Parabolic
Emilia P. Belserene
Maria Mitchell Observatory,
Nantucket, MA 02554
Received: 14 August 1989
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.
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