C star Comparison Table

Astronomy View all facts Glossary Help

physical object > natural object > celestial body > star > late star > carbon star > C star

Next carbon star: CS star Up: carbon star

C star comparison table

Subject is a kind of has spectral type has definition has hydrogen line strength

hydrogen-deficient C star hydrogen-deficient star F star, G star A subgroup of high-luminosity C stars with weak or absent hydrogen lines, mostly of types F and G. weak

lithium star C star G star, M star Peculiar giant star (spectral types G-M) whose spectra show high abundances of lithium. They are primarily S stars and carbon stars, although Li is also found in T Tauri stars, and is sometimes observed in normal late-type giants. Interstellar Li / H ≈ 2 × 10^-10. (Solar system Li / H ≈ 10^-9.) Lithium is destroyed rapidly (in about 7500 years) at typical nuclear burning temperatures. Spallation is the only production mechanism known for ⁶Li, but ⁷Li can be transported from the core in the form of ⁷Be and converted in the envelope to ⁷Li by electron capture. Observed ⁷Li / ⁶Li > 10.

N star C star cooler than G2 In the old terminology, the cooler C-type stars.

R star C star cooler than G2 Star with spectral characteristics similar to those of K stars except that molecular bands of C₂, CN, and CH are present instead of TiO bands.

Subject	is a kind of	has spectral type	has definition	has hydrogen line strength
hydrogen-deficient C star	hydrogen-deficient star	F star, G star	A subgroup of high-luminosity C stars with weak or absent hydrogen lines, mostly of types F and G.	weak
lithium star	C star	G star, M star	Peculiar giant star (spectral types G-M) whose spectra show high abundances of lithium. They are primarily S stars and carbon stars, although Li is also found in T Tauri stars, and is sometimes observed in normal late-type giants. Interstellar Li / H ≈ 2 × 10^-10. (Solar system Li / H ≈ 10^-9.) Lithium is destroyed rapidly (in about 7500 years) at typical nuclear burning temperatures. Spallation is the only production mechanism known for ⁶Li, but ⁷Li can be transported from the core in the form of ⁷Be and converted in the envelope to ⁷Li by electron capture. Observed ⁷Li / ⁶Li > 10.
N star	C star	cooler than G2	In the old terminology, the cooler C-type stars.
R star	C star	cooler than G2	Star with spectral characteristics similar to those of K stars except that molecular bands of C₂, CN, and CH are present instead of TiO bands.

Next carbon star: CS star Up: carbon star