View Full Version here: : My second star spectra - gcrux
26-04-2011, 07:45 PM
My second star spectra, after stuffing up the first one.
Meade 8" SCT
26-04-2011, 08:49 PM
Good work Rob.
Next step is to create an instrument response correction curve, and correct and normalise your spectra.
26-04-2011, 11:06 PM
Not to calibrate it.;)
27-04-2011, 01:19 PM
M3 type giant star
Richard Walker has an annotated spectrum of M type on p66 of his freeware atlas.
Which camera QHY8? which exposure?
Certain a good beginning...
Onwards and Upwards.
29-04-2011, 01:20 PM
On another note, here is a spectrum of the sun, taken with the ASEQ CCD spectrometer.
29-04-2011, 06:10 PM
The 50micron slit, Configuration D looks interesting.
Which one are you using? Have you tried it on a telescope?
29-04-2011, 06:41 PM
It can be mounted to a telescope using a t-adapter, t to c-adapter and c to SMA adapter. The main problem I can see is keeping the star centered on the SMA lens. A very accurate mount is required.
Spectral range: 200 – 1200 nm
< 5 nm (with 200 um fiber)
< 2 nm (with 50 um slit)
This has the greatest spectral range.
29-04-2011, 10:19 PM
You can use a flip mirror to find and position the star on the fibre....
A beamsplitter would be better that way you can guide as well.
30-04-2011, 04:56 PM
I don't believe these instruments will work for star spectra - they are not sensitive enough to gather adequate photons.
I have tried a couple of times, but the amount of light from a magnitude 1-2 star was insufficient to resolve the peaks.
Someone else might have more luck.
They will work with the moon and sun though.
I mainly use my spectrometer for minerals.
06-05-2011, 04:14 PM
Another solar spectrum with the ASEQ Spectrometer, but with slightly more lens aperture.
06-05-2011, 04:34 PM
Certainly shows the Na Doublet well...
Is the data file available? Fits format?
06-05-2011, 04:50 PM
The data file is only available as txt file (spectra file). There is no image file obtained with these instruments. Next, to use longer exposures.
06-05-2011, 05:00 PM
Here is an annotated spectrum for comparison (from the web, unknown source). Taken with the Ocean Optics CCD Spectrometer
Plus a good wiki link explaining the Fraunhofer_lines.
06-05-2011, 05:13 PM
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