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DY Persei

Due to the New England winter storm currently affecting the area, phone coverage at the AAVSO may be much reduced until Wednesday. The staff is still available via email, and we suggest using that method to contact us if you need assistance.

DY Per is the prototype of what is believed to be a distinct class of variable star.  While they exhibit some properties in common with the R Coronae Borealis stars, their fades occur with great regularity and apparently with the same period as their orbital periods when those are known.  Their light curves are dramatic but different from the RCB stars -- their amplitudes aren't as large, and fades and recoveries are shallower and more symmetric than the RCBs.  They're also a rare class, with only a handful known in the Milky Way, and even then there were only one or two known before automated searches of surveys began uncovering them.

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Prepared By: Matthew Templeton
AAVSO 49 Bay State Rd. Cambridge, MA 02138 617-354-0484