W Hya is an interesting southern semiregular-type variable star that is a source of maser emission. To learn about this season's featured variable, read on...
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JAAVSO Preprint "Period Changes in Pulsating Red Supergiant Stars: A Science and Education Project" by John R. Percy, Elena Favaro, Jou Glasheen, Bernadette Ho, Hiromitsu Sato, David G. Turner 05/09/08
JAAVSO Preprint "Infrared Passbands for Precise Photometry of Variable Stars by Amateur and Professional Astronomers" by Eugene F. Milone and Andrew T. Young 05/08/08