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Variable star
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====Very rapidly pulsating hot (subdwarf B) stars==== {{Main|Subdwarf B star#Variables}} The prototype of this rare class is [[V361 Hydrae]], a 15th magnitude [[subdwarf B star]]. They pulsate with periods of a few minutes and may simultaneous pulsate with multiple periods. They have amplitudes of a few hundredths of a magnitude and are given the GCVS acronym RPHS. They are [[P-mode star|p-mode]] pulsators.<ref name=kilkenny>{{cite journal|bibcode=2007CoAst.150..234K|title=Pulsating Hot Subdwarfs -- an Observational Review|journal= Communications in Asteroseismology|volume=150|pages=234β240|last1=Kilkenny|first1=D.|year=2007|doi=10.1553/cia150s234|doi-access=free}}</ref>
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