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Doppler split in Binary star system at FeI 6677.989Å | ||
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Description: This is a real spectrum of the eclipsing spectroscopic double-lined binary star HD94853. The two spectral lines we see is of the iron line at 667.7989 nm. I say one - since what we see is actually the same line twice - one from each star in the binary star system. The reason for the two lines being separated is because of Doppler shift - the stars are orbiting each other, and has opposite velocities relative Earth. The line has been fitted with a synthetic model of the system (the dashed line). In order to measure physical properties. Picture Stats: Views: 2363 Filesize: 7.19kB Height: 768 Width: 1024 Posted by: SlimJim at August 20, 2003, 12:12:07 PM Image Linking Codes
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Agafaster Posts:1175 | May 04, 2006, 09:37:06 AM @thread Quote
Iron absorption is also measured to give an indication of the metallicity of a star - the relative abundance of elements other than Hydrogen and Helium (to astronomers anything else is classified as a metal) this is usually expressed as a ratio of our Sun's metallicity. it gives a reasonable indication of the amount of lumpy bits in orbit around that star. I personally think that SlimJim is showing off his ascii prowess with the Angstrom symbol in the thread title ! ;-) |
Narayan Posts:254 | March 19, 2006, 12:21:32 PM Notify us when we reach alpha centauri captain. :crazy: :rtfm: |
GAG Posts:10 | January 29, 2004, 02:39:37 PM I made something like this with my Amiga! I mirrored it and ended up with a Vase...or was that two faces??? ;-) ;-) ;-) ;-) :-P |
odin Posts:6796 | November 26, 2003, 02:09:17 AM Quote Main : User's Artwork : Er......yeah...t'is a real work of art ;-). |
SlimJim Posts:752 | November 19, 2003, 02:14:26 PM Quote Poster: jeffimix Date: 2003/11/7 0:36:06 Ca II stands for the first ionized state of Calcium, not Carbon (that's C). In this case it was measured just for the purpose of finding eventual activity in the star -- and that was exactly what was found! :-D . SlimJim |
jeffimix Posts:853 | November 06, 2003, 11:36:06 PM why measure Carbon 2? |
that_punk_guy Posts:4526 | November 02, 2003, 12:50:51 AM Oh, to be university educated ;-) |
SlimJim Posts:752 | September 08, 2003, 08:11:40 PM @KennyR These are not emission features - they are absorption features of iron. I would be very surprised to find emission in these lines ... The Ca II is a special case, showing indations of chromospheric emission in the star. The Fe lines are a part of the abundance analysis, i.e. used to measure something else than the Ca II line. |
KennyR Posts:8081 | August 24, 2003, 02:57:15 AM Any reason why you went for the Fe emission line and not the much clearer Ca II as in your last one, SlimJim? |
SlimJim Posts:752 | August 20, 2003, 12:20:05 PM Now, is this raising the level of these galleries of what! :-D . SlimJim (sorry about the weird orientation. The image should be rotated 90 deg counter-clockwise). |