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another Beta Pict PP image maybe....
Hi all,
I post the following further results in his thread with kind permission from Rolf,
27 Nov results were redone right from scratch.
This is a very good data set. I had let a bad sub slip through
which shows as an elongated blob almost N-S on the central star(s).
I resized all dark calibrated/ BPM subs to 6x and restacked.
Difference layer was performed on the full dynamic range FITs of
Alpha and Beta this time, not a TIF or PNG crop.
Curves were performed on a TIF result.
A second 12th December set was also done.
This was , again , an exceptional night of data.
Same processing sequence was used.
Conclusions:
There again seems to be a promising bright artifact at the approximate P.A. of the protoplanetary disk.
While I am not even close to assuming I have nailed it, it really does
look promising.
I think a lot of follow up imaging needs to be done.
Rolf agrees that it would be great if others could try this technique.
It really is not such an onerous task.
1500mm F.L. imaging with 5-10 sec subs is not that hard.
Cooling a CCD doesnt seem to be a big deal either (the 10C result shows
the same artifact as 19C results).
What does matter is what Rolf has been saying all along:
The spider vanes do need to be thin and well aligned.
The night has to be exceptional seeing, otherwise the PP disk will smear
over more pixels.
IR filters don't seem to matter.
The use of a Baader IR filter has still picked up this artifact.
The timing of Alpha to Beta subs is critical, also as Rolf has been saying.
You can see by brutal manipulation of the difference layer that stars
have rings around them, most notably the central dot of the main stars.
If the timing had been exact, the central star would be black and not reappear after a severe stretch.
That means resolving the PP disk could get better if timing was tweaked
more.
On a personal note, nothing would give me more pleasure after many decades of imaging and observing under the stars, than knowing I
might have captured a protoplanetary disk around a star from a backyard
scope setup. For that possibility I have Rolf to thank for the inspiration.
Steve
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