Research Papers in Physics and Astronomy


Date of this Version

September 2000


Published by the University of Chicago Press. The Astronomical Journal. Copyright 2000 American Astronomical Society. Reproduced by permission of the AAS. Permission to use. PASP 112, 1262 (2000).


We have obtained photometric observations of the peculiar RR Lyrae star V442 Her during six observing seasons spanning an elapsed time of nearly 9 years. The period has undergone two large, abrupt changes in the past 5 years. Although light-curve modulation is fairly common among RR Lyrae stars, the modulation of the light curve of V442 Her is highly unusual for its large amplitude, long period, extreme alterations in light-curve shape, and large period changes.

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