by Thilo Bauer » Tue Aug 15, 2017 6:48 pm
Hi Ernst,
Just one question: Who is the lucky observer having had constantly good weather during the last 30 days?
Seriously, hard to tell. I found the data shown here starts at 15. July 2017 until today (see my last comment on this).
I assume, it is expected, that according to our discussion, the blue part of the wings should disappear first? Not quite sure without having seen the rest of the data points within a reasonable time frame before. It could be an effect of short time scale variation, or not.
During the occultation we should be able to estimate the size of the "disk", if there is a relatively sharp boundary, isn't it? Perhaps this is not the case and we have to consider some intensity variation. It could look like the expected integral intensity variation, if you think of an intensity plot of the projection of a planetary nebula, like M57 (without or with a hole, we will see).
On the other hand, and thinking of the mass transfer, this is not only disk, but also the big "tail" of mass from the supergiant to the companion. Not sure, what we should expect to see here on this very short time scale.
One other remark: I find it hard to transform the filenames of my spectra to Julian date quickly enough in my head. So I have to find a tool to translate. If we want to compare our results quickly, we should align on the preferred date format presented with our data. Either "natural" calendar dates, as Hugh presented his spectra based on file names, UTC or Julian calendar date. For a final presentation Julian dates or UTC might be reasonable decisions, however. For quick comparison, UTC should be more convenient, as this is easily done set up in my camera and observation log and usually quickly seen by inspection of the FITS files, which also use UTC datetime formats per convention instead of Julian date.
I appreciate your recommendation on this.
Thilo