Planetary nebula NGC 40 spectrum

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Christian Buil
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Joined: Mon Sep 26, 2011 6:59 pm
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Planetary nebula NGC 40 spectrum

Post by Christian Buil »

A spectrum of bright NGC 40 planetary nebula taken with a Celestron 9 + LISA + Atik460EX.

First the image from the guiding CCD camera:

Image

I took the spectra of two part, nebula and central star (a typical Wolf-Rayet star, T = 80000 K):

Image

The low exitation nebula spectrum:

Image

The hot star:

Image

Christian B

Nebula page: http://www.astrosurf.com/buil/nebula/nebula.html
Robin Leadbeater
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Joined: Mon Sep 26, 2011 4:41 pm
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Re: Planetary nebula NGC 40 spectrum

Post by Robin Leadbeater »

Hi Christian,

Have you noticed how similar the central star spectrum is to WR135?
http://www.astrosurf.com/buil/survey/wr ... html#WR135
Presumably this star is still losing material in powerful stellar winds.

Cheers
Robin

EDIT: I just looked up NGC 40. It is indeed classed as a Wolf Rayet star (type WC)
http://simbad.u-strasbg.fr/simbad/sim-b ... BAD+search
I spotted the similarity in the spectrum first though, honestly :-)
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
Christian Buil
Posts: 1431
Joined: Mon Sep 26, 2011 6:59 pm
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Re: Planetary nebula NGC 40 spectrum

Post by Christian Buil »

Exact Robin, the paralellism with WR135 is evident (a fine example of WC Wolf-Rayet star)

(Referenced here https://www.cfa.harvard.edu/~pberlind/a ... wrcat.html -> HD826)

Christian
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