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Rapidly oscillating Ap star
Rapidly oscillating Ap stars (roAp stars) are a subtype of the Ap star class that exhibit short-timescale rapid photometric or radial velocity variations. The known periods range between 5 and 23 min. They lie in the delta Scuti instability strip on the main sequence.
==Discovery==
The first roAp star to be discovered was HD 101065 (Przybylski's Star).〔(Kurtz, D.W. Information Bulletin on Variable Stars, vol 1436, 1978 )〕 The oscillations were discovered by Donald Kurtz using the 20 inch telescope at the South African Astronomical Observatory, who saw 10–20 millimagnitude variations in the lightcurve of the star with a period of 12.15 min.
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