AG Dra, EM Cep, Be stars

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etienne bertrand
Posts: 1040
Joined: Mon Aug 31, 2015 11:26 am

AG Dra, EM Cep, Be stars

Post by etienne bertrand »

CX Dra yesterday :
Image
Comparaison with the 18/05 - 23/05 :
Image

EM Cep :
Image
James Foster
Posts: 445
Joined: Sun Jan 24, 2016 7:14 am

Re: AG Dra, EM Cep, Be stars

Post by James Foster »

To: Etienne,

Nice results!.......I'm usually too scared of going beyond 900 sec sub-exposures in the city, but when i go to my dark sky site I may try a 1200 sub exposure
with the LhiresIII and 1800 l/mm grating.

James
James Foster
eShel2-Zwo ASI6200MM Pro
Lhires III (2400/1800/600 ln/mm Grat) Spectroscope
LISA IR/Visual Spectroscope (IR Configured)
Alpy 200/600 with Guide/Calibration modules and Photometric slit
Star Analyzer 200
etienne bertrand
Posts: 1040
Joined: Mon Aug 31, 2015 11:26 am

Re: AG Dra, EM Cep, Be stars

Post by etienne bertrand »

Hello James,
I think you must try long exposure, it's possible that near Ha there is not many lights ? Try for know if it's possible.
Try 300s, 600s, 900s, 1200s and make comparaison of the SNR, it's important ton make long time. you have a big diameter optique ?
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