British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Community Member Pages Mike Harlow
Image search

NGC6888 and WR136

Image

Expand image

About this observation
Observer
Mike Harlow
Time of observation
23/08/2019 - 22:00
Object
NGC6888 and WR136
Observing location
Ipswich, UK
Equipment
12 inch F/3.6 astrograph
Starlight Xpress H16 CCD
Astrodon luminance filter
8 inch 12 degree objective prism
Tags
Like This Image
Share

More fun with spectroscopy.

With Cygnus high in the sky an opportunity to image NGC6888 and take a spectrum of the central Wolf-Rayet star, WR136 (aka HD192163, V1770 Cyg). Ordinary CCD image on the left with the same field on the right taken through the objective prism...with the ghostly H alpha image of the nebula just about visible.

Provisional spectral line id given in C.  There seems to be some disagreement on line id from different sources on the internet.

More a chance to try out the equipment rather than anything new or scientific; but an encouraging result...

(Sorry about the orientation...north is to the left as the prism is mounted North-South which also gives red left and blue right.  Note also one advantage (or disadvantage?) of using a prism: dispersion is much greater at the blue end of the spectrum...!)

Comments

djswan2002's picture

Really, really nice, Mike. I miss using my StarAnalyser (grating) - I usually have my Hyperstar installed now. I think I might just swap it out and do some spectro. The prism works really nicely in your particular scope config. You can probably do some supernova characterisation - Robin L is the goto expert there. David

Andy Wilson's picture

Fascinating to see the image and slitless spectra of the field side by side. It clearly demonstrates how the spectrum of the Wolf-Rayet star has a different appearance to the other field stars.

Copyright of all images and other observations submitted to the BAA remains with the owner of the work. Reproduction of the work by third-parties is expressly forbidden without the consent of the copyright holder. For more information, please contact the webmaster.