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Дата изменения: Fri Dec 19 15:20:00 1997
Дата индексирования: Tue Oct 2 07:45:40 2012
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Поисковые слова: орбитальная обсерватория

Stellar spectroscopy

What can we learn about stars?

Light

is split into spectral colours, corresponding to wavelength. Red light has long wavelengths, blue light has short wavelengths.

Spectra

from hot objects are continuous, like a rainbow
atoms only emit light of specific colours, revealing their fingerprints as a line spectrum
atoms in front of a hot object absorb light at these colours, giving an absorption spectrum

Stellar spectra

are predominantly absorption spectra