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Nova Vul 2021

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Jeremy's picture
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Nova Vul 2021

This 12th mag transient in Vul recently posted on CBAT Transients page:

http://www.cbat.eps.harvard.edu/unconf/followups/J20210770+2914093.html

Amplitude is 9 mags

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Here's the field. I get it

Here's the field. I get it around mag 12 (unfiltered re Gaia G) and a position of 20:21:07.71 +29:14:08.9 (Gaia DR2).

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transient

I've just seen it visually at mag. 12.0 on Jly 16.948 UT,   It's a very red field, so poor comparison choices (high B-V).

Gary

EDIT July 18:  With the release of the AAVSO sequence, the above magnitude of 12.0 should be revised to 12.3.   Fortunately the AAVSO selected the same comparison star I used, but with a slightly fainter value.

Gary

Robin Leadbeater's picture
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Spectrum

A Low resolution (R~500) spectrum taken just now (20210716.915) shows strong H Balmer P Cygni profile emission lines with a velocity of ~1400km/s and other broad emission lines including He. (Looks like it is a Nova) 

https://britastro.org/specdb/data_graph.php?obs_id=10094

Continuing to take spectra.

Robin

 

 

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Low resolution spectrum

Just had a quick look at the object through the objective prism and as Robin has shown above there are strong H alpha and beta emission lines.

Image on my members page.

Mike

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Further confirmation as nova:

Further confirmation as nova: https://www.astronomerstelegram.org/?read=14793

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Nova in Vul

I saw it visually on 16. july 22.30 UT. Mag about 12.

Lars

Jeremy's picture
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Chart

There is an AAVSO chart and sequence here.

You can re-scale and re-orientate to your liking here.

Robin Leadbeater's picture
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Spectra

Spectra from the past two nights. (The first predates the one in the ATel by 4 hours) I have marked the main lines but there are a few currently unidentified. Suggestions welcome

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Nova Vul 2021

Hi Robin,

As I just posted in reply to your question on the ARAS Forum, I think these lines are C II which are seen in He/N novae.

This spectrum was recorded last night 17th July with a LISA and calibrated in absolute flux using the concurrently measured V magnitude of 13.10.

David

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reproducibility

Thanks David. Excellent reproducibility between our spectra taken less than an hour apart though my ALPY spectrum (in pink) is lower resolution of course.

Cheers

Robin

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Currently ~mag 13

After a drop in brightness in the first 24 h, the nova has been at ~mag 13 the last 3 nights. Not much of a light curve so far as we are in the early days of this eruption. Further observations are encouraged.

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The nova is about 0.3 mag

The nova is about 0.3 mag brighter tonight (July 20) than it was yesterday. My unfiltered photometry is around 0.4 mag brighter than V band since the nova is so red but the trend is pretty clear.  Of the other novae around V1405 Cas is brightening again although still around a magnitude below its brightest and V1674 Her is very gradually fading after its initial rapid decline. 

Jeremy's picture
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Yes, definitely a bit

Yes, definitely a bit brighter last night, Nick: ~0.25 mag brighter on Jul 20 in CV for me compared to 24 h earlier.

Jeremy's picture
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Continues to brighten

Continues to brighten gradually:

Robin Leadbeater's picture
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spectrum evolution

There has been significant evolution in the spectrum, the He I N II C II lines being replaced by Fe II lines as the classification Atel suggested might happen

Cheers

Robin

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Nova

Awful seeing last night, haze and patchy cloud, managed to get 1 visual observation with my 10 inch which I’ll upload late. Weather forecast doesn’t look good for the next couple of night. Skies around here Risca just outside Newport in Wales do have a lot of light pollution 

Robin Leadbeater's picture
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Evolution in spectrum to Fe nova confirmed

The evolution to an Fe II type nova as I highlighted in my spectrum from 24th July has now been confirmed 

https://www.astronomerstelegram.org/?read=14816

Cheers

Robin

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Lightcurve

Interesting to read that ATEL. I've managed to observe it on 12 of the 14 nights since discovery and my unfiltered photometry shows it still rising as of last night.

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