S-type star
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An S-type star is a cool giant star with approximately equal quantities of carbon and oxygen in its atmosphere. The class was originally defined in 1922 by Paul Merrill for stars with unusual absorpti
W Aquilae is an S-type star and Mira variable with a close companion resolved by the Hubble Space Telescope.
The surface of the red giant star π1 Gruis from PIONIER on the VLT
Carbon star
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A carbon star is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen. The two elements combine in the upper layers of the star, forming c
S-type star
…lines and molecular bands now known to be due to s-process elements. The bands of zirconium monoxide (ZrO) are a defining feature of the S stars. The carbon stars have more carbon than oxygen in their atmospheres. In most stars, such as class M giants, the atmosphere is richer in oxygen than carbon and they are…
Y Canum Venaticorum, a carbon star in the Canes Venatici constellation, in optical light
Echelle spectra of the carbon star UU Aurigae
Optical light image of the carbon star VX Andromedae