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Results tagged with spectra
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user 4085
Questions about the observed frequency range of the electromagnetic radiation of a celestial object.
4
votes
Accepted
Are hot stars like O-type stars entirely composed of helium?
The lines that appear in a stars spectrum mainly reflects its temperature not its composition, see here
O-type stars start out with the same sort of composition as other stars, that is they are mainl …
- 3,285
0
votes
Why isn't everything yellow(ish)?
The solar spectrum peaks somewhere near green, but that is not directly relevant to its apparent colour which is a result of the actual spectrum and the sensor response. If there is enough intensity i …
- 3,285
6
votes
What is an "arc" spectrum ?
An arc spectrum is one produced by a discharge lamp where the discharge is through ionised gas, in the case of He-Ar a mixture of Helium and Argon, which produces a predictable line emission spectrum. …
- 3,285
2
votes
How to disentangle a very distant star's relative velocity vs. redshift distance
We measure the aggregated red-shift of galaxies not single stars, which averages out the motion of the stars within the galaxy. This leaves us with the proper motion of the galaxy to deal with, which …
- 3,285