Hi there !
From time to time a student ask a question and you realize that you no longer understand anything about your physics.
Here, regarding light emission mechanisms of stars ( nowadays, and 1st generation ):
( disclaimer: not native english speaker )
How is it that stars emit (roughly) a Planck spectrum (let forget the
case of O & B here), while they are mostly composed of atomic/ionized H
and He ? (i.e. no mechanical degree of freedom other than velocity).
- Are the "metals" and dust (if there is any left) doing the job ?
but then the first generation of stars would not have radiated as a
Planck spectrum ? ( while they do, right ? )
- May the recombination and jump lines enough to explain the spectrum ?
- Possibly with the help of Doppler blurring of the lines ?
- When the species are largely ionized, might it be that the EM
waves are directly emitted by the electron plasma (in ~continuous modes, therefore) ? but it seems doubtful to cover the visible frequencies with this.
- Something else ?
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