Subject |
has surface temperature |
is a kind of |
has absorption line |
has luminosity class |
has spectral type |
has definition |
has color |
A star | 10000 K | early star | H I | | O, B, A, and early F | Star with spectral type A in which the spectrum of the Balmer lines of hydrogen attain their greatest strength. Helium lines can no longer be seen. Some metallic lines are present; in late A stars the H and K lines of ionized calcium appear. A0 stars have a color index of zero. | white |
giant | greater than 1000 Kelvin | star | | III | | High-luminosity star that lies above the main sequence on the Hertzsprung-Russell diagram. | |
white giant | 10000 K | A star | H I | III | | A giant star of spectral type A. Some RR Lyrae stars are white giants. | white |