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VHIRES / MEDRES
Posted: Thu Jul 03, 2014 10:36 pm
by Christian Buil
Some view of definitive version of VHIRES (R = 45000 - large echelle grating) and MEDRES (here a 80 x 80 mm 300 l/mm grating working at order #1)
Instant change from the version (thanks to optical bench). Rigid setup for high precision radial velocities measure. The refractor is a FSQ85ED astrograph
(apochromatic), working here in autocoillimation mode.
More details here:
http://www.astrosurf.com/buil/vhires/test.htm
Some recent spectra of ultraviolet part taken by using MEDRES mode (ideal for teach
spectral classification):
Christian B
Re: VHIRES / MEDRES
Posted: Fri Jul 04, 2014 1:14 am
by Paul Luckas
I admire people who can confidently balance a 6000 Euro grating on a couple of spare counterweights on a messy work area desk.
Seriously though - very interesting work.
Paul
Re: VHIRES / MEDRES
Posted: Fri Jul 11, 2014 1:19 pm
by Christian Buil
Add of a cross-disperser to VHIRES for take enlarged spectral domain (ideal a 7 deg. prism, used in double-pass) :
Typical result. A ThAr spectrum:
and a documented 2D solar spectrum:
The spectral domain for each order is only 40 A (in the red). But it is extended by a factor 20
relative to a pass-band filter selector. R = 45000 of course. It is a potential exoplanet killer...
Mode details here:
http://www.astrosurf.com/buil/vhires/demo3.htm
(addition d'un disperseur croisé à mon VHIRES, pour accroitre le nombre d'ordres
observés simultanément).
Christian B
Re: VHIRES / MEDRES
Posted: Sat Jul 12, 2014 6:14 am
by Olivier GARDE
Christian,
Superbe réalisation !!!!
La spectro pro à la portée des amateurs (heu, certainement moyennant finance car le réseau coute un certain prix.. et c'est sans doute le cas également pour le cross-disperser)
Se serait bien si tu pouvais nous faire un petit topo à l'OHP dans 2 semaines ?
Olivier GARDE
Re: VHIRES / MEDRES
Posted: Mon Jul 14, 2014 12:43 pm
by Christian Buil
Re: VHIRES / MEDRES
Posted: Mon Jul 14, 2014 4:03 pm
by Olivier GARDE
What about the magnitude limit with the VHIRES @ R=50000 and your optic ?