SHG shot caH caK for today

highfnum · Post by **highfnum** » Fri Sep 18, 2015 8:56 pm

near end of day -- had to rush
but thay came out ok
caH

: cahseptc.JPG (122.15 KiB) Viewed 1731 times

highfnum · Post by **highfnum** » Fri Sep 18, 2015 8:57 pm

caK

: cakshgaseptc.JPG (120.6 KiB) Viewed 1730 times

Post by **Merlin66** » Sat Sep 19, 2015 1:31 am

Well done, mate!
Looks like you're getting good results from the SHG.

Montana · Post by **Montana** » Sat Sep 19, 2015 12:14 pm

Very nice images

Alexandra

highfnum · Post by **highfnum** » Sat Sep 19, 2015 4:49 pm

thx guys/gals I notice subtle differences between caK and caH
what is your opinion on difference?

I reprocessed
I have learned that even selecting exact line position on spectrum can effect outcome of image
caH redo notice little prom on right

: cahsun4sept.JPG (138.57 KiB) Viewed 1691 times

highfnum · Post by **highfnum** » Sat Sep 19, 2015 4:50 pm

caK redo - Idont see little prom on right

: caK4sept.JPG (141.92 KiB) Viewed 1691 times

highfnum · Post by **highfnum** » Sat Sep 19, 2015 4:53 pm

Merlin66 what is the spiel(NY slang) on caH vs caK?

Post by **Merlin66** » Sat Sep 19, 2015 10:33 pm

The calcium II lines form a pair of resonance lines, like the sodium doublet(D1 and D2).
According to Gray and Corbally "Stellar Spectral Classification" they "....grow with decreasing temperatures down to spectral type K5 (4500K)...." They, and the Sodium D1/D2, Magnesium I triplet, Halpha as well as the CaII triplet lines 8498/8542/8662A are used to determine chromosphere activity in stellar systems. Zirin and others seem to "prefer" observing in CaK but with no reasons given....
Summary- there's no real difference between K and H lines for data content.

MapleRidge · Post by **MapleRidge** » Sun Sep 20, 2015 12:57 am

Great images...well done!!!

Brian

Post by **marktownley** » Sun Sep 20, 2015 9:23 am

Good shots!

Post by **Merlin66** » Sun Sep 20, 2015 11:12 am

J-P,
The possible interference between the CaH line (3968A) and the nearby Hepi line (3970A) seems to be at least part of the reason for the selection of the CaK for observers.

highfnum · Post by **highfnum** » Mon Sep 21, 2015 10:06 am

sept 20 caH very clear sky
prom and filaments

: cahfilmsept20.JPG (101.06 KiB) Viewed 1640 times

DSobserver · Post by **DSobserver** » Mon Sep 21, 2015 11:03 am

good shot!

I think that improving slit focus, you would reach even better results...

highfnum · Post by **highfnum** » Mon Sep 21, 2015 11:23 pm

im trying
200mm collminator lens = tricky to get just right
im thinking of increasing to 300mm

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