| Subject |
has surface temperature |
is a kind of |
has absorption line |
has definition |
has color |
|---|
| A star | 10000 K | early star | H I | 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 |
| peculiar star | greater than 1000 Kelvin | early star | | Star with spectra that cannot be conveniently fitted into any of the standard spectral classifications. Denoted by a p after spectral type. | |
| Ap star | 10000 K | A star | H I | Peculiar A-type stars ("magnetic" A stars) that show abnormally strong lines, sometimes of varying intensity, of certain ionized metals. Recent evidence indicates that all Ap stars are slow rotators compared with normal A stars. | white |
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