VV Cep evolution at low resolution

VV Cep 2017-2019 Campaign
Moderator for this forum: Ernst Pollmann

Re: VV Cep evolution at low resolution

Postby HughAllen » Wed Feb 14, 2018 8:58 pm

Hi Ernst,
I really appreciate your feedback. It is fascinating to see the comparison with the high resolution campaign results, there seems to be a reasonable correspondence. The integration interval that I use is determined by the points at which the Hα obviously emerges from the underlying continuum, so the width of the interval can vary slightly from spectrum to spectrum. So for example the width of the interval on my last spectrum captured on 11th Feb was 6554 - 6576Å, on some other spectra it has been maybe 1 or 2Å wider. Regarding the accuracy, I have been wondering for a while how to estimate the error bar I should asscoiate with the values in the graph. Would you have any advice on how to estimate that when the true value may be varying naturally from night to night?
Hugh Allen
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Re: VV Cep evolution at low resolution

Postby Ernst Pollmann » Fri Feb 16, 2018 3:55 pm

at least I would try to take spectra for several hours in order to determine the EW within the same wavelenght interval.
Over time, you can clearly see if the "intrinsic" EW has actually changed drastically. However, it should be remembered that the V-magnitude of the continuum may change during this time. At least I would try.

Ernst Pollmann
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Joined: Mon Sep 26, 2011 7:16 pm


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