M15 & Pease 1 - 2nd try - OSC and NB (andrea tasselli)

M15 & Pease 1 - 2nd try - OSC and NB

This a very, very difficult target (well, maybe with a couple meters telescope up in the Atacama not that difficult). I've tried before with non-conclusive results as far as clear-cut detection is concern (let's not think of direct imagery as at 3" near the core of a very busy globular is kind of difficult). From spectroscopy we know that roughly speaking the emission in the H-alpha band is equal to that one in the OIII bands and H-beta for this PN. This brings in an intersting consideration: if we image M15 in the two main NB emission lines then the overall aspect of the PN, whilst not directly resolvable as a distinct object, should nonetheless appear as a white patch (as an HOO image, with H-alpha=R, OIII + possibly H-Beta=G/B) while all the stars in the GC should appear having either reddish hue (maybe orange-ish) and bluish hue. I put this theory to the test while testing my new (but old) 30 cm f/4 newt capturing M15 through an OSC camera fitted with the Optolong L-eNhance 3-band filter (right hand image). I then doubled down by acquiring 30min each in the H-alpha and OIII bands with a 50 cm remote telescope (left hand image). In both cases the resultant imagery has been obtained by drizzling so that effectively a doubling of the image scale was obtained. In both cases a white patch was detected in the right position although, as expected, the image taken with the 50cm resolves it a bit more (less fuzziness in the patch) in part because of the larger aperture and in part because of the better seeing (1.7" on average, against 2.3").

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