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Here is a spectrum of Nova Cas 2021 taken on 6th August with a LISA (R~1065) and calibrated in absolute flux using a concurrently measured V magnitude of 7.70. There are broad emission lines of H I Balmer and He I, all with P-Cygni absorption dips. The Balmer emission lines have FWHM ranging from 14...

Last night, 3rd August, I measured Nova Vul 2021 at V=10.97, B-V=1.14, almost a magnitude fainter than 48 hrs before and slightly redder. The following LISA spectrum (R~1062) was calibrated in absolute flux using this V magnitude and response corrected with the B9III MILES star HD192907 recorded at ...

Hi Robin,

Fe II (42) lines were starting to appear even earlier on 19th July.
David

Here is a spectrum taken with a LISA on July 17.901 in slightly hazy conditions. Concurrent photometry gave a V magnitude of 13.10 which was used to calibrate the spectrum in absolute flux. I think the lines Robin is asking about are C II which are seen in He/N novae. David novavul2021_20210717_901_...

The WZ Sge star V627 Peg has been reported in outburst by Maeda Yutaka (Japan) confirmed in observations by the ASAS-SN Sky Patrol and ZTF. Christian Knigge (Southampton U) is putting together a multi-wavelength campaign to study the outburst. Amateur data will be welcome. Last night (15th July) I o...

Here is a plot showing the evolution of the nova over the period 12-18 June using low resolution (R~500-1000) spectra from the ARAS database calibrated in absolute flux either by the observer or using V mags from the AAVSO database averaged in quarter day bins and interpolated to the times of the sp...

The following plot shows the change in absolute flux of the nova over the last 4 days. These R~1000 spectra have been calibrated in absolute flux using concurrently recorded V magnitudes of 6.35, 8.38 and 9.77 respectively.

David

The spectrum tonight looks very different. It is now about 2 magnitudes fainter.

David

Here is a low resolution R~1000 spectrum of the new bright object in Her, now announced in ATel 14704 as a nova. Taken with a LISA on a 0.28m SCT. This has been instrument and atmospheric response corrected.
David

Hello David,

This posting by Christian on the Forum should answer your question.

http://www.spectro-aras.com/forum/viewt ... isis#p7177

David