А жұлдызы

А жұлдызы

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.

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Industry/Domain: Astronomy
Category: General astronomy
Company: Caltech
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the light produced by excited atoms and ions in the upper atmosphere of a planet

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Astronomy; General astronomy

A measure of the minor axis of an elliptic orbital of an electron according to the Bohr-Sommerfeld theory.

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