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The possible chemical composition of a highly evolved star is a series of layers of different chemical composition.
U Cephei is a classic example of such a system for which spectroscopic evidence shows streams of gas flowing from the more highly evolved star to the hotter companion, which is now the more massive of the two.
Instead Li and his colleagues conclude in a paper published in the Dec. 15 issue of the journal Nature that the companion was most likely a normal star like the sun, a somewhat evolved star called a subgiant, or perhaps a white dwarf.
Asteroseismic observations with the Kepler satellite probed the deep interior of an evolved star.
The Kepler satellite reveals details of the oscillations patterns of an evolved star in an exotic triple-star system.
Consequently, the majority of stellar collisions do not take place between two MS stars, but involve an evolved star of giant-dimensions.
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The story is different in evolved stars like giant stars.
These evolved stars have a He core surrounded by an outer H shell.
Kwok, S. The synthesis of organic and inorganic compounds in evolved stars.
Harris, M. J., Lambert, D. L., Hinkle, K. H., Gustafsson, B. & Eriksson, K. Oxygen isotopic abundances in evolved stars.
Both host stars show subsolar metallicities of -0.390 0.060 dex and -0.100 0.040 dex, respectively, and are (slightly) evolved stars.
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