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Sometimes several lines are seen that correspond to different radial velocities,
implying that two or more clouds are moving with distinct speeds along the path.
Such patterns are found in the two sodium D lines (5,890, 5,896 A) and the H and
Velocities in the line of sight have been determined for many stars from the
Doppler effect, which shifts all lines by an amount proportional to wavelength. To
make such Measure- a determination, a spectrum of medium to high disper- ment
Figure 3: The emission spectrum of the Orion Nebula from 3700 to 5100 A.
showing the Balmer lines of Hydrogen, due to ... The strongest fluores- line of the
helium ion, at 304 A, is emitted by the nebula, cence and this wavelength
happens to ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review