Re: Absorption lines are unaffected by Doppler shift.

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#7563

From: Androcles
Date: Mon, 17 Oct 2005 12:35

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"Mike Ruskai" <BUTthannydI@DONTearthlinkLIKE.netSPAM> wrote in message
news:p9e6l11lb82t69h35rricaqkhsp448qgoe@4ax.com...
| On or about Sat, 15 Oct 2005 18:15:56 GMT did "Androcles" <Androcles@
| MyPlace.org> dribble thusly:
|
| >"The spectral class [of stars]  is determined by the relative 
positions
| >and intensities
| > of the absorption lines, and these are unaffected by a Doppler 
shift."
| >'Nuff said, nobody could top that, not even Tom Roberts with his
| >observation
|
| It's a completely correct statement.  Though it does require that one
| be familiar with the term "relative", understand what it means, and
| grasp the rather significant effect upon meaning it has in the above
| statement.
|
| Absorption lines as a whole are *SHIFTED*, not spread out, which is a
| paraphrase of what's said above.
| -- 
| - Mike


Let there be a line at 500 nm and a line at 1000 nm.
The associated frequencies will be (according to conventional stupidity)
3.0E+08 /500.0E-09 = 6.08E+14 Hz
3.0E+08 /1000.0E-09 = 3.0E+14 Hz

Let these frequencies be Doppler-shifted (red) to 4.0E+14 Hz and 2.0E+14 
Hz.
The lines will then appear at
15.0E-07
7.5E-07

1500 nm   -  750 nm = 750 nm
1000 nm   - 500 nn = 500 nm

Since Mike Ruskai said I dribbled thusly, I'm entitled to call Mike 
Ruskai
 a stooopid drooling idiot.
Androcles.

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Subject: Re: Absorption lines are unaffected by Doppler shift.
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