CH Cyg at high resolution
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CH Cyg at high resolution
Hi all
I had to wait for snow flurries to clear but I finally managed to get CH Cygni with my new 1800 lpm grating.
ISIS reports a resolution of 8898 so not quite 10,000, but good S/N.
Tim
I had to wait for snow flurries to clear but I finally managed to get CH Cygni with my new 1800 lpm grating.
ISIS reports a resolution of 8898 so not quite 10,000, but good S/N.
Tim
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Re: CH Cyg at high resolution
CH Cyg on Dec 19 - showing changes for Halpha since last observation on the 2nd.
Tim
Tim
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Re: CH Cyg at high resolution
Hi tim,
Excellent spectra of red region!
(can you give more about your spectrograph setup : optical configuration, components, weight, images (?))
Christian
Excellent spectra of red region!
(can you give more about your spectrograph setup : optical configuration, components, weight, images (?))
Christian
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Re: CH Cyg at high resolution
Hello Tim,
EXcellent. That perfectly responds to the request of Dr Skopal.
Of course, the fit is welcome in the database !
François
EXcellent. That perfectly responds to the request of Dr Skopal.
Of course, the fit is welcome in the database !
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: CH Cyg at high resolution
Thanks Christian and Francois.
Christian,
Shortly after I joined the ARAS group I posted a description of my setup with photos here: http://www.spectro-aras.com/forum/viewt ... ?f=8&t=811
The important details are:
Telescope:
311cm home built corrected f9.8 Dall Kirkham with a 45mm dia. diffraction limited field.
Spectrograph:
- classical home built designed for low resolution
- f6.6 focal reducer built in to spectrograph mount
- 23 um slit (an APLY slit) gives 2.3 arcsec width after the f6.6 reducer. Reducer delivers an image circle of 1 arcsec from 400 to 750 nm.
- collimator - Edmund spherical mirror with 101.6 mm fl (203.2 mm radius)
- gratings - Edmund 25x25 mm, 600 and 1200 lpm and an Optometrics 25x50 mm 1800lpm
- collimator to camera angle - 38 degrees
- camera - 85 mm f1.8 Nikon lens (internal focus). Better than average resolution - got lucky!
- imager - QSI583 (5.4 um pixels)
Calibration source:
- Relco lamp behind a frosted aperture and motor driven into beam so as to illuminate the spectrograph identically to the telescope.
Weight of the spectrograph with the reducer guide and calibration assembly but without the imagers is 1.5 Kg
Originally I had some flexure problems that resulted in small orientation dependent wavelength shifts but these were
tracked down to flexure of the front face of the QSI 583 and movement at the camera lens mount. Both were solved.
With the 1800 lpm grating I have pushed this classical design to the limit. The 0.63 anamorphic factor results in a 14 um slit image on the CCD.
Focus is thus critical and I had to change the imager mounting to allow a precise tilt to be dialed in for each grating rotation.
I now have a table of tilts versus grating rotation that enables me to set this up quickly.
Tim
Christian,
Shortly after I joined the ARAS group I posted a description of my setup with photos here: http://www.spectro-aras.com/forum/viewt ... ?f=8&t=811
The important details are:
Telescope:
311cm home built corrected f9.8 Dall Kirkham with a 45mm dia. diffraction limited field.
Spectrograph:
- classical home built designed for low resolution
- f6.6 focal reducer built in to spectrograph mount
- 23 um slit (an APLY slit) gives 2.3 arcsec width after the f6.6 reducer. Reducer delivers an image circle of 1 arcsec from 400 to 750 nm.
- collimator - Edmund spherical mirror with 101.6 mm fl (203.2 mm radius)
- gratings - Edmund 25x25 mm, 600 and 1200 lpm and an Optometrics 25x50 mm 1800lpm
- collimator to camera angle - 38 degrees
- camera - 85 mm f1.8 Nikon lens (internal focus). Better than average resolution - got lucky!
- imager - QSI583 (5.4 um pixels)
Calibration source:
- Relco lamp behind a frosted aperture and motor driven into beam so as to illuminate the spectrograph identically to the telescope.
Weight of the spectrograph with the reducer guide and calibration assembly but without the imagers is 1.5 Kg
Originally I had some flexure problems that resulted in small orientation dependent wavelength shifts but these were
tracked down to flexure of the front face of the QSI 583 and movement at the camera lens mount. Both were solved.
With the 1800 lpm grating I have pushed this classical design to the limit. The 0.63 anamorphic factor results in a 14 um slit image on the CCD.
Focus is thus critical and I had to change the imager mounting to allow a precise tilt to be dialed in for each grating rotation.
I now have a table of tilts versus grating rotation that enables me to set this up quickly.
Tim
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Re: CH Cyg at high resolution
CH Cyg on Dec 28th - compared to my last two spectra.
Tim
Tim
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Re: CH Cyg at high resolution
H alpha CH Cyg 10-03-2015
eShel + SC 10" + ATIK 460EX
Traitement : ISIS
Comparison with Tim Lester's spectrum
Rappel : H alpha campaign for Augustin Skopal : at least 1 spectrum a month
Low resolution spectra are welcome
François Teyssier
eShel + SC 10" + ATIK 460EX
Traitement : ISIS
Comparison with Tim Lester's spectrum
Rappel : H alpha campaign for Augustin Skopal : at least 1 spectrum a month
Low resolution spectra are welcome
François Teyssier
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: CH Cyg at high resolution
CH Cyg on 25-03-2015.
H alpha and H beta compared to Christian's last eShel spectrum on the 17th.
Tim
H alpha and H beta compared to Christian's last eShel spectrum on the 17th.
Tim
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Re: CH Cyg at high resolution
Excellent !
The campaign begins well
There are several absorptions on the blue edge as your spectrum shows
Note : Augustin Skopal prefers that the spectra are corrected for heliocentric velocity
(I'll precise this point in the next letter)
François
The campaign begins well
There are several absorptions on the blue edge as your spectrum shows
Note : Augustin Skopal prefers that the spectra are corrected for heliocentric velocity
(I'll precise this point in the next letter)
François
François Teyssier
http://www.astronomie-amateur.fr
http://www.astronomie-amateur.fr
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Re: CH Cyg at high resolution
Another animation of CH Cyg : time serie of 64 exposures of 180s each (3H)
For Halpha
For H Beta (see the small emission line near 4888 Â)
For Halpha
For H Beta (see the small emission line near 4888 Â)
LHIRES III #5, LISA, e-Shel, C14, RC400 Astrosib, AP1600
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html
http://o.garde.free.fr/astro/Spectro1/Bienvenue.html