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Complicated period changes in HQ Lyrae and DF Cygni.

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Emilia P. Belserene

Maria Mitchell Observatory, Nantucket, MA 02554




The O-C diagrams of HQ Lyrae and DF Cygni cannot be described by equations of reasonably simple form. The sine curves which had statisfied limited stretches of data have failed to maintain their usefulness. A new linear ephemeris is given for HQ Lyrae.


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