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Hello all, A few days ago, data from the AAVSO website showed a new and very clear increase in the brightness of Nova Cas 2021... The light curve shows that Nova Cas 2021 had a new maximum of luminosity around September 9-10 with a magnitude of about 6.5 !! Since this date, the magnitude of the Nova...

Hello all, Jean-Philippe Nougayrede wrote : Hi Christophe. Maybe some kind of inhomogeneity in the fireball ? Hi Jean-Philippe, Yes, why not ! The changes in the profile of the Halpha line are not easy to explain... The inclination of the system, the complex shape of the ejecta and its expansion, th...

Hello all, Hi Jean-Philippe, Yes, the Nova Cas 2021 is still very bright ! This is a great opportunity to follow it at low and high resolutions ! As I had indicated in my previous post, a peak located at about +785 km/s appeared around August 27 in the profile of the Halpha line of Nova Cas 2021. So...

Hello all, Thank you David for this very interesting article ! Here is my new comparison between my two last spectra of the Halpha line of RS Oph at high resolution on August 31 at 20 h 42 TU (resolution of 19094, JJ = 2459458.3626, acquisition time of 50 min (5 x 600s)) and on September 2 at 20 h 5...

Hello all, Hi Joan, Thanks for your comment ! The monitoring of the details visible in the Halpha line profile of this nova is really exciting: we need an expert to understand their evolution ! It's also very interesting to see the parallel evolution of the Halpha and HeI 6678 A lines you mention : ...

Hello all, Congratulations to all the observers for these very great results on RS Oph !! Here is my comparison between my last spectrum of the Halpha line of RS Oph at high resolution on August 27 at 20 h 54 TU (resolution of 18249, JJ = 2459454.3706, acquisition time of 60 min (6 x 600s)) obtained...

Hello all, Thank you Matthieu ! Have you looked at your spectrum in detail ? There are details that I think are interesting to identify... Comparing your spectrum with other spectra in the ARAS database obtained before and after 26 August by other observers, I cannot find these details... I wonder a...

Hello all, Very impressive Christian !! Here is my comparison between my two last spectra of the Halpha line of RS Oph at high resolution on August 24 at 21 h 55 TU (resolution of 19342, JJ = 2459451.4132, acquisition time of 10 min (1 x 600s)) and on August 25 at 21 h 38 TU (resolution of 18044, JJ...

Hello all, Here is my new comparison between my three last spectra of the Halpha line of Nova Cas 2021 at high resolution on August 21 at 0 h 06 TU (resolution of 18050, JJ = 2459447.5045, 8 x 600s), on August 25 at 0 h 35 TU (resolution of 17672, JJ = 2459451.5241, 7 x 600s) and at 23 h 33 TU (reso...

Hello all, Not so easy to follow the RS Oph outburst with the parade of clouds the last few days !! Here is a comparison between my three last spectra the Halpha line of RS Oph at high resolution on August 12 at 21 h 24 TU (resolution of 16932, JJ = 2459439.3915, acquisition time of 70 min (7 x 600s...