Observation by James Weightman: Vega Spectrum

Uploaded by

James Weightman

Observer

James Weightman

Observed

2023 May 15 - 22:00

Uploaded

2023 May 16 - 14:07

Objects

Vega

Equipment

see image

Exposure

see image

Location

Cirencester, Glos, UK

Target name

Vega (alpha Lyrae)

Title

Vega Spectrum

About this image

Simple attempt to show more Balmer lines in the spectrum of this A type star using a monochrome camera rather than, for example, a colour DSLR.

Files associated with this observation

vegaspecdemo.jpg (279.8 kB)

Like this image

Jeremy Shears, Mike Harlow, Callum Potter, Hugh Allen, Robin Leadbeater, Philip Jennings

Comments

Mike Harlow, 2023 May 17 - 05:52 UTC

Hi James,

Nice spectrum. From your description it looks like you're using a GRISM system? If you have more details I would be interested to know how it's constructed; dimensions and spacings for example.

Thanks,

Mike.

James Weightman, 2023 May 17 - 09:45 UTC

I used the 3.8 degree prism from Paton Hawkesley (q.v.) primarily because it centres up the spectrum; I placed it in front of the grating. I am not sure what other benefits it provides with the limited resolution provided by my equipment. btw envious of the wide field images taken with objective prism.

Mike Harlow, 2023 May 17 - 10:16 UTC

Hi James,

You may know about this already but there is a nice GRISM spectrograph on the 0.5M University of Iowa telescope based in Arizona. See: grism-ajp-jan03.pdf (uiowa.edu)

Yes, the prism is nice to use and it makes finding things really easy.

Mike.

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