2018
DOI: 10.48550/arxiv.1809.04484
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A Study of Pulsation and Fadings in some R Coronae Borealis Stars

John R. Percy,
Kevin H. Dembski

Abstract: We have measured the times of onset of recent fadings in four R CrB stars -V854 Cen, RY Sgr, R CrB, and S Aps. These times continue to be locked to the stars' pulsation periods, though with some scatter. In RY Sgr, the onsets of fading tend to occur at or a few days after pulsation maximum. We have studied the pulsation properties of RY Sgr through its recent long maximum using (O-C) analysis and wavelet analysis. The period "wanders" by a few percent. This wandering can be modelled by random cycle-to-cycle pe… Show more

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