My second star spectra - gcrux

[Astrobserver99]

My second star spectra, after stuffing up the first one.

Atik webcam
Star Analyzer
Meade 8" SCT

gamma crux

[sheeny]

Good work Rob.

Next step is to create an instrument response correction curve, and correct and normalise your spectra.

Al.

[Terry B]

Well done.:thumbsup:
Not to calibrate it.;)

[Merlin66]

M3 type giant star
Richard Walker has an annotated spectrum of M type on p66 of his freeware atlas.
http://www.ursusmajor.ch/astrospektroskopie/richard-walkers-page/index.html

Which camera QHY8? which exposure?

Certain a good beginning...
Onwards and Upwards.

[Astrobserver99]

Thanks guys.
On another note, here is a spectrum of the sun, taken with the ASEQ CCD spectrometer.

[Merlin66]

http://aseq-instruments.com/LR1.html

The 50micron slit, Configuration D looks interesting.
Which one are you using? Have you tried it on a telescope?

[Astrobserver99]

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.

I have
Configuration B:
Spectral range: 200 – 1200 nm
spectral resolution:
< 5 nm (with 200 um fiber)
< 2 nm (with 50 um slit)

This has the greatest spectral range.

[Merlin66]

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.

[Astrobserver99]

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.

[Astrobserver99]

Another solar spectrum with the ASEQ Spectrometer, but with slightly more lens aperture.

[Merlin66]

Certainly shows the Na Doublet well...
Is the data file available? Fits format?

[Astrobserver99]

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.

[Astrobserver99]

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.

http://en.wikipedia.org/wiki/Fraunhofer_lines

[Merlin66]

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