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Some updated spectra. These are from last week - more to come when I manage to get my system back on line.

Pete

and here are the B spectra and the dodgy (ie suspicious-looking) V spectrum from 10 September 2024.

Comments welcome

Pete

Some spectra on the latest nova in Scorpio. BY way of background, the nova was originally discovered on 2024-09-09.4363 UT at 11.4 mag (unfiltered) (see CBAT notification here:http://www.cbat.eps.harvard.edu/unconf/followups/J17064645-3528079.html ). It was classified as a classical nova by Yusuke ...

Thanks Olivier

Responding to your comments:

1. CDK design - yes, the scope includes a lens set which I expect impacts on sensitivity in the UV. I don’t expect it’s the principal issue but it’s worth keeping in mind. There’s not much I can do about it though.

2. Flats - I agree that the flats are ...

While I have not received a reply to this post I do see that it has been viewed 88 times so I'll keep updates coming in case this is of interest to anyone else.

In ISIS in the Masters tab there is a tool to combine flat frames to produce a PRNU. The command line FILL_LEFT [image in] [image out] [x ...

Researching online, I encountered (again!) the excellent. presentation that Christian Buil and Valerie Desnoux gave at ASW2020. It refers to the challenges of obtaining a suitable flat frame in the UV.

It refers to a command tool - I assume in ISIS - to reduce noise in the flat. However, I can't ...

I have been struggling recently with processing of data collected in the UV and suspect that my issues stem from my flat frames.

The spectroscope is a UVEX with a 600 lines/mm grating. The camera is an AS533MM with images unbinned. The grating is positioned to replicate the bandpass of the Johnson ...

I've been following this nova this week. It rises quite late in the morning so I have limited time to collect data. Its also fading quite rapidly so the SNR is falling away as well.

The best quality spectrum I have is for 23 February 2023. I've marked the most prominent lines. Resolution is around ...

Another spectrum of V520 Mon - this time in the UV.

Taken with UVEX 600 lines/mm grating on a PW CDK 12.5.

There is nothing particularly remarkable to see. Balmer and He I absorption lines. The H beta line is in emission and, like the spectrum from 10 December, the line is definitely split. I ...

v520mon_20221210_514_Peter Velez.png Another target from the Database - V520 Mon.

This is in the visual range - roughly H beta to H alpha - taken with a UVEX 600 lines/mm grating on a CDK 12.5. I only managed 4 x 600s so its a bit noisy.

Simbad records a spectra type of O9.5-B0Ve and lists it as ...