[vsnet-campaign-be 245] Re: [amateur_spectroscopy] FWHM of Del Sco H Alpha Line

[Michael Koppelman <lolife@bitstream.net>]

How about focus? The group I work with at the UofM measures what they call equivalent width, which is the width of the feature if it was squared into a rectangle. This makes focus a non-issue, or so I'm told.

This would be an interesting result. 

Cheers,
Michael Koppelman

On Saturday, July 12, 2003, at 08:32 AM, DWest61506@aol.com wrote:

> I measured the Full Width at Half Maximum (FWHM) of the H Alpha line on a spectrum of mine taken on 07/22/02 UT of del Sco and got 9.5 +/- 1.5 Angstrom.  I measured my most recent spectrum http://members.aol.com/dwest61506/page78.html taken on 07/12/03 and obtained a FWHM of 10.1 +/- 1.5 Angstrom.  Both measurements have been corrected for instrumental effects.  Based on the values and the error estimates I would conclude that there hasn't been any significant change in the FWHM of the H Alpha line in del Sco in the last year.