Original price $14,768.00 - Original price $14,768.00
$14,768.00 - $14,768.00
Current price $14,768.00
eShel II is the core piece of your echelle spectroscopy solution for your astronomical projects. Fitted with a second generation collimator, it takes your spectra to the Hδ line !
Spectral domain extended from 30 to 55 against 32 to 52 previously.
Resolution higher than 10 000 for orders 33 to 53
It is based on our strong experience in spectroscopy (with design and manufacturing of the Lhires III and Lhires Lite) and nights of observations including with MuSiCoS & Narval spectroscopes. This practical experience helped us to design a robust and productive solution in the field.
We designed the spectroscope with Christian Buil, a higly recognized optician expert. The software module has been written by Michel Pujol, an expert in Tcl/Tk and AudeLA platform. They both complement our expertise to bring you the best solution in echelle spectroscopy for astronomy !
Choice of optical fibre has been made to increase radial velocities measurement accuracy and for a better confort in using the eShel.
This technique makes it possible to reach high spectral resolutions because it uses the diffraction orders > 20 of a grating. The spectrum obtained passes through a cross disperser that “cuts” the spectrum in several successive orders by occupying the entire surface of the sensor of the camera. This gives the entire spectral in visible range on about twenty order (in the case of eShel).
The main module that generates the Echelle spectrum. It covers the spectral range from about 450 to 700 nm with a resolution > 10000 (with an ATIK 460 Ex camera in 2×2 binning not included). It has a fiber input on FC / PC connector to fix the 50 μm object fiber.
Delta Sco spectrum (Be star). Note the H-alpha line in emission (click on the image to enlarge)
Canon 40D, 9 x 300 s, 8′ SCT télescope (C.Buil)
Easy to use, it is based on the AudeLA software ‘opensource’, written in Tcl/Tk, works under MS Windows (several languages available), it allows during the acquisitions of spectra, to remotely control the various units (injection unit and calibration unit).
Spectrum reduction can be started right after the acquisition by generating a multi-HDU fits file. An export of the individual orders or the combined spectrum (all orders merged) can also be realized.
Example of calibrated spectrum of Beta Persei, between H-beta and H-alpha (click on the image to enlarge)
Beta Lyr – Shelyak [:-)] & P Cygni – 7 x 300 s 8′ SCT
Here is also a good exemple of echelle spectroscopy with an animation of raw images of BW Vul, a pulsating star. 5min expoures, 60cm f/3.5 telescope at pic du Midi; QSI 516s camera.
Here is a spectrogram of BW Vul around Sodium doublet :
You have to add to the set up, an optical fiber object of 50 µm, an optical fiber calibration of 200 µm, an autoguiding camera and a main camera for spectra
Check latest beta version of AudeLA software which now inlcudes eShel module in standard :
Check also vcredist_x86 Microsoft program that you may need to install fo AudeLA to run properly.
Shelyak 1-Year Warranty