Nova Sgr 2021 (a)

Alerts and Monitoring of Novae

Nova Sgr 2021 (a)

Postby Francois Teyssier » Sat Mar 27, 2021 5:33 pm

http://www.astronomerstelegram.org/?read=14487

TCP J18490521-1902054: Hideo Nishimura, Kakegawa, Shizuoka-ken on 2021 03 25.761 UT and by Yuji Nakamura, Kameyama, Mie, Japan, on 2021 03 25.8034 UT with 11.2 mag

Send spectra to francoisamathieu.teyssier at gmail.com and copy to arasdatabase at gmail.com for inclusion in the database
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Re: Nova Sgr 2021 (a)

Postby Forrest Sims » Sun Apr 11, 2021 7:17 pm

HI everyone,
Here are 3 flux calibrated spectra of Nova Sgr 2021a taken with my LISA spectrograph over a 12 day period. The first one was while the nova was still increasing in brightness, the middle spectra was near peak brightness and the last one when the nova was declining in brightness. The AAVSO chart show the V filter photometry to match the spectra. Very nice to have so many Novae to observe. For me Nova Sgr 2021a barely reaches 30 deg altitude. Quite a challenge with trees and houses:) The spectra are in the database.

Woody
Attachments
Nova Sgr 2021a photometry.png
novasgr2021a_20210328_499_Forrest Sims. comparison.png
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Re: Nova Sgr 2021 (a)

Postby Forrest Sims » Sun Apr 25, 2021 9:51 pm

Hi,

Here is an update on Nova Sgr 2021a from last night. The plot includes my prior observation from 2021-04-08 for comparison. Both spectra are flux calibrated which explains the offset in the graph. I recorded the V magnitude at 11.18 last night and the previous 2021-04-08 observation had it at V mag 9.80.

I think I have correctly identified the FeII [42] triplet lines?

Woody
Attachments
novasgr2021a_20210425_440_Forrest Sims flux comparison.png
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Re: Nova Sgr 2021 (a)

Postby Paolo Cazzato » Tue May 04, 2021 11:42 am

Hallo everybody,
here my simply comparison at low resolution made using alpy600 not flux calibratied. I can see an evolution in the spectrum noting an incresing of expansion gas from around 900km/s to 1600 km/s. It would be very interesting to continue acquiring spectra to evaluate the evolution but unfortunately in my location from now on it will be more difficult to take spectra in Sagittarius since the sun rise early.
Attachments
comparison.jpg
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