spectro-aras.com

A comparison of the nova spectrum on Monday and yesterday evenings with my Alpy 600 spectroscope. If the visual magnitudes are assumed to be similar on the two evenings then an increase in the Balmer emission is visible with a small decrease in the HeI emission Cheers Hugh Nova Cas 2021 Mar 22 v Mar...

Latest update on the progress of the VV Cep eclipse. It looks like the eclipse of the Balmer emission region is fully over. I'll follow the star for another month or two in order to complete the baseline this side of the eclipse. Thanks to all those who allowed me to include their low res spectra in...

Thanks Robin, it's very interesting to learn of the new AAVSO spectroscopic database. Regarding the preference to submit rectified (normalised) spectra I am surprised by that. It can be very difficult reliably to draw the continuum especially for cooler stars with complex spectra. And what about the...

At low resolution the ending of the eclipse is now very apparent, which is consistent with the latest results from the high res campaign recently posted by Ernst Pollmann...

Hugh Allen

Latest update of the progress of the VV Cep eclipse using observations by Jim Ferrera, James Foster and myself. The latest observation by James on 28th October has shown a remarkable fall in the Hα emission...

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A remarkable spell of warm, clear weather here in Southwest England has allowed me to re-start VV Cep observations, just at the time when it is starting to climb well above the north east horizon during darkness. Now in deepest eclipse it's clear that the Hα emission is not going to fall to zero, an...

Hi Thilo, Would you be able to let me have the fits file of your 21st April spectrum? The Equivalent Width measurement method would then be consistent with the way I have measured the earlier spectra in my graph. I will then add that measurement to a table of all of my measurements and send that bac...

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 continu...

Latest update to my chart of Hα and Hβ Equivalent Widths. Thanks Jim Ferreira and James Foster for providing their spectra so that we have much better sampling of the two curves. The Hα curve had been showing a general decline overlaid by periodic re-brightening in line with Ernst Pollmann's high re...

Has the Hα eclipse reached second contact at last? My latest observation tonight 7th Jan suggests that the fading of the Hα emission may have reached a plateau.A cycle of brightening now would not be expected based on the approximate period that can be discerned in the earlier data. Another measurem...