AG Dra, EM Cep, Be stars

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AG Dra, EM Cep, Be stars

Postby etienne bertrand » Thu May 24, 2018 9:37 am

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

EM Cep :
Image
etienne bertrand
 
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Re: AG Dra, EM Cep, Be stars

Postby James Foster » Fri May 25, 2018 1:03 am

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 R. Foster
Lhires III (2400 & 1800 ln/mm Grat) Spectroscope,
LISA Visual & IR Kit Spectroscope,
Alpy 600, and Star Analyzer 200
James Foster
 
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Re: AG Dra, EM Cep, Be stars

Postby etienne bertrand » Fri May 25, 2018 11:08 pm

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 ?
etienne bertrand
 
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