British Astronomical Association
Supporting amateur astronomers since 1890

Secondary menu

Main menu

BAA Community Member Pages Kevin Gurney
Image search

Carbon star spectral features

Image

Expand image

About this observation
Observer
Kevin Gurney
Time of observation
26/10/2018 - 23:58
Object
WZ Cas, W Ori
Observing location
West Sheffield
Equipment
Altair Astro 10in RC truss tube
LHires 600l/mm
Atik 460EX
MESU200 mount
Prism, Demetra, Isis
Exposure
6 subs at 300s each
Tags
Like This Image
Share

I decided it would be refreshing to look at something  other than H alpha in Be stars for a change...

Richard Walker has a good section on Carbon stars in his Spectroscopic Atlas which inspired me to look at some of the highlights therein.

WZ Cas has strong Lithium absorbtion at 6708A (panel b), and an even stronger sodium absorbtion around 5890. This is in fact a doublet which is just visible (I think!) in my medium resolution spectrum (panel a)

In contrast, W Ori has no strong Lithium absorbtion (panel d), but has a complex of lines at the blue end know as Merrill Sanford bands, apparently due to Silicon dicarbide (SiC2) - see panel c

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.