Paper:	There is Something About CaH
Volume:	448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Page:	907
Authors:	Jao, W.-C.
Abstract:	CaH is one of the most important stellar atmospheric molecules, since C. M. Olmsted first detected it in the spectra of Sun spots in 1908. Over the past century, CaH bands have been identified on almost every stellar objects, including giants, subdwarfs, dwarfs and brown dwarfs. These unique absorption features have been widely used to separate dwarfs from subdwarfs in the past decade. I review a few milestones of studying CaH bands, what we learn from them, and finally, how we can interpret modern spectroscopic data.

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