Quote:
Originally Posted by Glenpiper
Re the decreasing hydrogen amplitude ratios: I think it is real, and not a result of Ha saturating. I will be attending the RASNZ conference in Wellington next weekend and, fortuitously, Bill Allen will be presenting a paper on Eta Carinae. He has been observing this star for 30 years and knows a lot about its behavour ... in fact his paper puts forward the theory that it has a companion with a period of 5.5 years. I will discuss the H amplitude matter with him.
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Don't rush in Bernard.
Here's a little comparison of 2 spectra captured last night. The blue profile is the 13.7s exposure, the pink is a failed attempt to capture the long exposure as an avi file. The exposure in the avi file was not as specified in IC Capture but was something less than 1/3.75 of a second (3.75 frames per second frame rate).
While the exposure on the avi isn't ideal, the ratio of Ha/Hb is clearly different. This suggests to me that the longer exposure was overexposed and the Ha line was clipped.
Thoughts?
Al.