Processed spectrum

Forums Variable Stars Nova Cas 2021 Processed spectrum

Mike Harlow

Hi Hugh,

Wow…that’s a really nice spectrum!  I’m impressed that you got such a nice result from the .jpg without even seeing the .fts file. Anyway, it does show one thing…I need to get to grips with some spectroscopy software to produce some more useful results.

You’re right that the red end is saturated as it’s difficult to get the exposure right to show both ends correctly exposed, especially for red objects. 

Some background on the prism.  It was instrument no. 179 in the BAA instrument collection and I took it out on loan in 2012.  Thanks to Bob Marriott for organising the loan and even delivering it in person!  I purchased it from the BAA a few years back when the instrument collection was finally sold off.  Apparently it has been used by some famous names in the past including Mike Hendrie and David Sinden.  But most notably it was used in the 1980s and 1990s by Maurice Gavin for much of his pioneering work on spectroscopy with film and CCDs.  This work was published in the BAA Journal in 1996:  ‘Stellar spectroscopy with CCDs-some preliminary results’.  J. Br. Astron. Assoc. 106(1) 1996, p11-15.

It may be old technology but as you’ve shown it can still produce useful spectra. And given it’s history I feel I should keep using it as long as I can.

Thanks for taking the time to analyse my spectrum…I must make more effort!