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With the nearly
full moon lighting up the entire sky, a clear night can not be
wasted! So I put the 100lpmm Star Analyzer in front of the DBK41
color camera and shot some interesting stars with the 10 inch.
The seeing was very bad, I was not able to see the companion
of Sirius visually, just a huge puffy blob. Prime focus with
the scope stopped to 4 inches to improve off axis performance
(without a coma corrector) made for smaller blobs. While the
sharpness of the spectra is not optimal, I did learn a lot about
the colors of some unusual stars. So here they are all 10 of
them, with spectral types indicated.
Images were processed
in Rspec, and calibrated for camera and instrumental response.
The originals were recorded at 11.4 Angstroms per pixel.
Click thumbnails
for larger view!
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Instrument: 10" f/3.9 Home made Newtonian stopped to 4 inches
Grating: Star Analyzer 100 lpmm
Mount: Astrophysics 1200 QMD
CCD Camera: DMK41 Imaging Source
Location: Payson, Arizona, Elevation: 5150 ft.
Sky: Seeing FWHM = 10 arcsec , Transparency 9/10
Outside Temperature: 25 F
Image Processing Tools: RSpec for spectral extraction, Photoshop CS2
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