Description
This catalog is intended to list all Galactic S stars having known positions of at least roughly the precision of the Henry Draper catalog. An S star is a star in whose spectrum the bands of the ZrO molecule are detectable, ordinarily without needing sufficient spectral resolution to resolve the individual rotational lines of a band. In addition, stars exhibiting readily detectable LaO in the photographic infrared, where there is no significant ZrO, are known to form a subset of S stars (more extreme in abundances or low temperature), and this catalog includes stars classified only from the infrared. The majority of the stars were, however, discovered on the basis of the (0,0) band, with head near 6474Angstroem, of the red system of ZrO.
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