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Spectra Profiles Of Albireo B

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#1 brownrb1

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Posted 22 September 2020 - 02:45 AM

Albireo B_09_18_2020 IR-JPEG.jpg Albireo B_09_18_2020-JPEG.jpg

Hi,

Here are 2 profiles of Albireo B-one of the profiles is instrument response curve corrected. I used a 10" f/10 Meade SCT with a f/6.3 reducer, an Alpy 600 with 23 um slit, and a Atik Infinity monochrome camera. I used Demetra to acquire the image and RSpec to do the data reduction. With the profile that is with the IR curve applied  the spectra Pickles spectral library reference profile that is over laid shows the star to be a B9Ve star.

Thanks

Dick


Edited by brownrb1, 22 September 2020 - 03:10 AM.

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#2 robin_astro

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Posted 22 September 2020 - 05:48 AM

Nice result. What reference star did you use to  do the flux calibration?  

The Balmer absorption lines look weaker than in the Pickles B9v reference. Is this real (eg due to emission in the core of the absorption lines) or just an effect of difference in resolution? (A measure of the Equivalent Width of the lines would eliminate resolution as a cause)

 

Cheers

Robin



#3 brownrb1

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Posted 22 September 2020 - 10:13 AM

Albireo B 07_10_2020P_JPEG.jpg Hi,

I used Vega as the reference star. I think that my object image is under exposed-I don't believe that my Infinity camera is that appropriate one for getting spectra through a slit. Attached is the profile of an Albireo B spectrum that I imaged several months ago using my Alpy with the 3 mm hole-I think that this configuration might be best until I can get the appropriate camera.

Thanks

Dick 

 



#4 descott12

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Posted 22 September 2020 - 07:18 PM

Nice spectrum. Do you have any problems with chromatic aberration at the blue end of the spectrum when using your reducer?I was using my Celestron 0.63 reducer on my C8 and it was causing so much of the fish-tailing effect that I stopped using it.



#5 brownrb1

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Posted 29 September 2020 - 02:27 PM

Hi Dave,

I'm not sure-could you attach an image to show the effect.

Thanks

Dick



#6 descott12

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Posted 29 September 2020 - 02:58 PM

Hey Dick,

Here is a pretty good example. See how it widens out like a fish tail at the blue end?

Attached Thumbnails

  • Alkaid_00001_WithDisplayStretch.jpg


#7 Jamey L Jenkins

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Posted 29 September 2020 - 03:40 PM

Happened upon your posts and thought I had imaged Albireo B spectrum in the past. Found the normalized profile on my Flickr page and have posted it here. SA 100 with a 102mm f/7 refractor and DMK41 mono camera. Nice works guys!!

Attached Thumbnails

  • alberio B 9_15_17.jpg


#8 brownrb1

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Posted 01 October 2020 - 05:49 PM

Hi Dave,

I checked some of my spectral images that I got with my 10" Meade f/10 SCT with the Meade f/6.3 reducer and I saw no evidence of the fishtailing that you have in your image. I don't know if the fact that I'm using a Meade scope with the Meade reducer is a factor.

Dick




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