Last new mood I tried the Galactic Cirrus around Messier 13, after seeing and reading the results of Mel.
With the 6" refractor which gave me a field of around 4° (f/5 + 30mm 3" eyepiece) and very good transparency of an High Alps location I could detect a nearly closed ring around the glob.
What makes me wonder is the missing of any deep image of M 13 which shows these brightening. Even a stretched DSS image shows no hints of any nebula.
So beside Mel's results which seems similar, are there any other sketches or descriptions of these nebula? I read that Mal shows these nebulas at the OSP, but what were the results?
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