Pure S stars, also called zirconium stars, are those in which zirconium oxide bands are very strong and titanium oxide bands are either absent or only barely detectable. Almost all S stars are long-period variables. So-called SC stars appear to be intermediate in type between S stars and carbon stars (C stars) and have a carbon/oxygen abundance ratio near unity.
Examples include Chi Cyni (the brightest S star visible from Earth) and S Ursae Majoris.
Related entry• technetium star
Related category• TYPES OF STARS
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