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Old 09-05-2020, 08:30 PM
Heian (Mark)
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Starting again

Hi all,
after a long, long break from astronomy and spectroscopy, I have made an effort to get back into it again. The attached images are from some Be stars and Gamma Velorum taken last night.

The images were taken through the SA100 / Meade dsi3 combination attached to a 200mm f/5 reflector. The images have only had simple processing with no instrument response correction through BASS.

This combo gives approx 29A/px.

The next step will be to re-learn the software.

Any comments would be welcome
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Click for full-size image (p Car.jpg)
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Click for full-size image (QY Car.jpg)
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  #2  
Old 10-05-2020, 02:36 PM
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jjjnettie (Jeanette)
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Good to hear you're back on the wagon
Comet Swan has been my inspiration to start again. Relearning the software has been a painful and time consuming experience.
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Old 12-05-2020, 12:39 PM
Saturnine (Jeff)
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Great to hear you're getting back out into the dark again Mark, can't say that I fully understand spectroscopy but someones got to do it, otherwise we would never learn anything.
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Old 12-05-2020, 05:38 PM
Heian (Mark)
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Thanks Jeff and jjjnettie,
I did some more image capture on Sat night, but with some mods to the setup. I've extended the SA100 / CCD spacing and added a grism to the setup.
I'm now getting in the order of 8.9A/px, compared to the original 29A/px.

I went back and re-imaged a target from first night again. It's easy to see that the curve is not as "lumpy" as it was. The target was QY Carina. The slightly higher resolution is on file QY Car spectrum.png"

I've also included a spectrum of Eta Carina for good measure

cheers
Attached Thumbnails
Click for full-size image (QY Car spectrum.png)
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Click for full-size image (Eta Car spectrum.png)
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Old 26-05-2020, 06:57 PM
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Merlin66 (Ken)
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Mark,
Sorry mate, I missed your post!
Well done you have some interesting results there.
The next step is to image an A type star and develop an IR correction curve.
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Old 27-05-2020, 12:46 PM
Heian (Mark)
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Hi Ken,
i did get a spectra of Alpha Volans, and A2v star to do just that but I was getting what I thought an unusual result when I divided my capture with A2v reference in the BASS software.

I posted a question on the group.IO site and John and yourself commented on the next step. I just haven't done it yet.

From what I can see, the B+W chip in the DSi3 collects further into the blue end than other CCD's I have imaged with.
I've added the partially processed images.
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Click for full-size image (alpha vols A2v.png)
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Click for full-size image (alpha vols A2v division.png)
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Old 27-05-2020, 02:01 PM
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Merlin66 (Ken)
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Mark,
yes I remember now...
Just crop below 370 and above 750nm and see how you go.
Ken
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  #8  
Old 28-05-2020, 05:30 PM
Heian (Mark)
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Hi Ken,
thanks for the offer of assistance with my issue of the IR for the spectra of Alpha Volans.
I've added the file as a jpg, which is the only one I could get to load.

I'll keep plugging away to see if i can get it to work after all...
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