Re: Alert! Nova Cas 2021 mag 9
Posted: Sat May 01, 2021 9:47 pm
Hello all,
Here is our last update for the monitoring of the Nova Cas 2021 with two new spectra.
The first one was obtained the 28th of April at 1 h 49 TU (resolution of 525, JJ = 2459332.5756) with an Alpy 600 and an acquisition time of 60 min (40 x 90s) :
and the second one was obtained the 29th of April at 1 h 19 TU (resolution of 539, JJ = 2459333.5548) with an Alpy 600 and an acquisition time of 30 min (20 x 90s) :
The relative intensities of the FeII lines continue to increase but it seems less rapidly between the 27th and the 29th than between the 25th and the 27th...
Evolution of FeII lines (42) between April 18 and 29 : Evolution of FeII lines (27) and (28) between April 18 and 29 : Note also the evolution of the “blue” part of the Balmer lines from Halpha to Hdelta visible even at low resolution.
Evolution of the “blue” part of the Halpha line at low resolution (for example) between April 18 and 29 : The relative intensities of HeI lines continue to decrease...
Evolution of the HeI line at 5876A (for example) between April 18 and 29 : The sky has been cloudy for a few days here... we hope other observers have better skies !!
Marion THOMAS et Christophe BOUSSIN
Here is our last update for the monitoring of the Nova Cas 2021 with two new spectra.
The first one was obtained the 28th of April at 1 h 49 TU (resolution of 525, JJ = 2459332.5756) with an Alpy 600 and an acquisition time of 60 min (40 x 90s) :
and the second one was obtained the 29th of April at 1 h 19 TU (resolution of 539, JJ = 2459333.5548) with an Alpy 600 and an acquisition time of 30 min (20 x 90s) :
The relative intensities of the FeII lines continue to increase but it seems less rapidly between the 27th and the 29th than between the 25th and the 27th...
Evolution of FeII lines (42) between April 18 and 29 : Evolution of FeII lines (27) and (28) between April 18 and 29 : Note also the evolution of the “blue” part of the Balmer lines from Halpha to Hdelta visible even at low resolution.
Evolution of the “blue” part of the Halpha line at low resolution (for example) between April 18 and 29 : The relative intensities of HeI lines continue to decrease...
Evolution of the HeI line at 5876A (for example) between April 18 and 29 : The sky has been cloudy for a few days here... we hope other observers have better skies !!
Marion THOMAS et Christophe BOUSSIN