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28 March 2017 at 10:09 am
#578072
![](https://britastro.org/wp-content/uploads/2018/11/picture-219-1541235408-80x80.jpg)
Participant
Hi Tony,
That is the broad Raman scattered O VI line at 6825A. See http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1989A%26A…211L..31S&data_type=PDF_HIGH&whole_paper=YES&type=PRINTER&filetype=.pdf
It was a mystery for a long time until Schmid published his paper. It’s a trademark of symbiotic stars with high excitation nebulae.
David