Article View: sci.physics.relativity
Article #7564Re: Absorption lines are unaffected by Doppler shift.
From: Paul B. Andersen
Date: Mon, 17 Oct 2005 21:25
Date: Mon, 17 Oct 2005 21:25
44 lines
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3335 bytes
Androcles wrote: > "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 So they are Doppler shifted by 0.5. Z = -0.5. That is a blue shift. Colour blind, Androcles? Paul
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X-Google-Thread: 10f545,2dbfbfa79603a5b5 X-Google-Thread: 10b271,d45805f30d16221d X-Google-Thread: fdc67,d45805f30d16221d X-Google-Thread: 10cf28,d45805f30d16221d X-Google-Thread: f871d,d45805f30d16221d X-Google-Attributes: gid10f545,gid10b271,gidfdc67,gid10cf28,gidf871d,public X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news1.google.com!news2.google.com!news.maxwell.syr.edu!uninett.no!not-for-mail From: "Paul B. Andersen" <paul.b.andersen@deletethishia.no> Newsgroups: sci.physics.relativity,sci.physics,alt.astronomy,alt.binaries.astronomy,uk.sci.astronomy,gac.physics.astronomy Subject: Re: Absorption lines are unaffected by Doppler shift. Date: Mon, 17 Oct 2005 23:25:45 +0200 Organization: HiA Lines: 44 Message-ID: <dj14sq$bja$1@dolly.uninett.no> References: <P_g%e.19914$iW5.309@fe3.news.blueyonder.co.uk> <i8crj11j03i6vq329stackled162skji23@4ax.com> <1128330387.104120.20430@g44g2000cwa.googlegroups.com> <4o02k1do899k3hmmovmmpieojgqv9aa5lm@4ax.com> <1128424624.429266.186850@g47g2000cwa.googlegroups.com> <kuv5k15e65jjb9f44egkok6qht68k537c0@4ax.com> <1129067309.314427.64350@z14g2000cwz.googlegroups.com> <2ikok1p9ttrd0nifufenuflm2hkh2h5uv7@4ax.com> <dir555$965$1@dolly.uninett.no> <wHb4f.34240$U9.16999@fe3.news.blueyonder.co.uk> <p9e6l11lb82t69h35rricaqkhsp448qgoe@4ax.com> <bUM4f.33259$ey6.28845@fe1.news.blueyonder.co.uk> Reply-To: paul.b.andersen@deletethishia.no NNTP-Posting-Host: fgrm281.grm.hia.no Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: dolly.uninett.no 1129584346 11882 128.39.201.25 (17 Oct 2005 21:25:46 GMT) X-Complaints-To: news-abuse@uninett.no NNTP-Posting-Date: Mon, 17 Oct 2005 21:25:46 +0000 (UTC) User-Agent: Mozilla Thunderbird 0.9 (Windows/20041103) X-Accept-Language: en-us, en In-Reply-To: <bUM4f.33259$ey6.28845@fe1.news.blueyonder.co.uk>