Planetary nebula NGC 40 spectrum

[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:



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



The low exitation nebula spectrum:



The hot star:



Christian B

Nebula page: http://www.astrosurf.com/buil/nebula/nebula.html

[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

[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