Spectrohelioscopes - Fred Veio - Zeeman Effect

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Spectrohelioscopes - Fred Veio - Zeeman Effect

Post by Merlin66 » Sat Feb 14, 2015 12:53 am

Fred has asked me to pass this on to the members, for information.

Zeeman lines with a spectrohelioscope, JBAA, vol. 116, page one, 2006. By Veio and Higgins.

Veio and Higgins observed some lines with the latter spectrohelioscope in 2002 : 5.5 meter f.l.
concave mirror for telescope , 3.0 meter f.l. concave mirror for spectroscope, 1200 gr/mm
grating, linear dispersion 3.2A/mm in first order, 1.4A/mm in second order. Visual mode.
A single achromat of about 50 to 60mm mm f.l is used and works excellently. Do not use a compact
Plossl eyepiece of two close achromats with equivalent 50mm f.l. Does not work very good.
Always use short f.l. achromats. About 25mm diameter is all right.

The Journal lists 24 Zeeman lines that you can see with the shs. if you want to see all the
lines, then you must make a similar shs. If you make a compact shs per Phil Rousselle
or Andre Rondi, both of France, you will see the lines by electronics and a CCD. They
use for the telescope about 125mm aperture and 1.4 meter f.l., for the spectroscope
about one meter f.l., grating 1800 gr/mm, first order about 5.0A/mm. Zeeman lines seen
per computer and ccd are not exactly the same as seen by the human eye.

5219.7A, 5224.3A, 5224.6A, close blend, in umbra, widening.

5225.5A, 5247.6A, 5250.2A, all clean split about 0.3A, in penumbra and umbra.

5426.3A, 5429.2A, 5432.6A, 5899.3A, 6554.2A, 6556.1A, 6572.8A, 6572.A, 6575.0,
widen in the umbra only, about 0.2 to 0.3A.

6134.6A, 6135.1A, 6135.4A, a blend, in the umbra.

6137.0A, 6173.3A, first line is strongest visual line with not so clean split, second line is
second strongest visual line with a clean split, and it is one of the main lines used at
Mt Wilson. The split is seen in the penumbra and in the umbra, 0.3A wide. These two
lines should be seen split in compact shs, just barely so.

6232.6A, split line, in penumbra and umbra.

6233.2A, 6707.8A, 6743.1A, all widen in umbra only.

You must have a certain amount of focal length for the telescope and the spectroscope in order
to see some of the lines above. An 1800 gr/mm grating is preferred to have more linear dispersion.
If questions, let me know. Cheers, Fredrick Veio, shs past 50 years.
"Astronomical Spectroscopy - The Final Frontier" - to boldly go where few amateurs have gone before
https://groups.yahoo.com/neo/groups/ast ... scopy/info
"Astronomical Spectroscopy for Amateurs" and
"Imaging Sunlight - using a digital spectroheliograph" - Springer

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Re: Spectrohelioscopes - Fred Veio - Zeeman Effect

Post by swisswalter » Sat Feb 14, 2015 8:32 am

Thank you Ken
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE :)

from 7 am - 7 pm http://www.nanosys.ch

from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa ;)

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