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AM Casseiopeiae

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AM Cas is a dwarf nova with a busy light curve.  A typical dwarf nova might show outbursts of several magnitudes interspersed with occasional stretches of quiescence where it only varies by a magnitude at most.  AM Cas is a little different in that it appears to be continuously variable, with nearly continuous variations of about a magnitude, interspersed with outbursts of perhaps two magnitudes.  It was originally classified as a Z Camelopardalis variable, but despite having near continuous activity it doesn't seem to have the extended periods of standstill that mark the classical Z Cam stars.  Like many other CVs, AM Cas has become less well-observed in recent years, making it harder to track behavior like what we see here.

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