Probable nova in Hercules mag 6.4 !

Alerts and Monitoring of Novae

Probable nova in Hercules mag 6.4 !

Postby Robin Leadbeater » Sat Jun 12, 2021 6:45 pm

From VSNet

Cheers
Robin

-----Original Message-----
From: vsnet-alert <vsnet-alert-bounces@ooruri.kusastro.kyoto-u.ac.jp> On Behalf Of Patrick Schmeer pasc1312-aavso@yahoo.de via vsnet-alert
Sent: 12 June 2021 17:09
To: vsnet-alert@ooruri.kusastro.kyoto-u.ac.jp; vsnet-newvar@ooruri.kusastro.kyoto-u.ac.jp; cvnet-outburst@groups.io; baavss-alert@groups.io
Subject: [vsnet-alert 25957] TCP J18573095+1653396: bright probable nova (mag. 6.4) in Hercules

TCP J18573095+1653396 = ZTF19aasfsjq (N:) (submitted to VSX)

Discovered on 2021 June 12.537 UT at mag. 8.4 by Seiji Ueda (Kushiro, Hokkaido, Japan):
http://www.cbat.eps.harvard.edu/unconf/ ... 53396.html

ZTF light curve, data, and images (via Lasair):
https://lasair.roe.ac.uk/object/ZTF19aasfsjq/

Possibly recorded on the rise (gmag. ~16.3 on June 12.192 UT) by the ASAS-SN Sky Patrol:
https://asas-sn.osu.edu/sky-patrol/coor ... 6b21100256

Source No. 4514092717838547584 in Gaia EDR3 (Gmag. 19.95).

Spectroscopy and multiband photometry are urgently required.

Clear skies,
Patrick
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Re: Probable nova in Hercules mag 6.4 !

Postby David Boyd » Sat Jun 12, 2021 11:53 pm

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
novaher2021_20210612_927_D_Boyd.png
novaher2021_20210612_927_D_Boyd.png (34.24 KiB) Viewed 2004 times
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Re: Probable nova in Hercules mag 6.4 !

Postby HughAllen » Sun Jun 13, 2021 1:49 am

And here is my Alpy spectrum of Nova Her 2021. I've not seen a spectrum like this before...
Nova Her 2021  2021.06.12.939.png
Nova Her 2021 2021.06.12.939.png (30.14 KiB) Viewed 1989 times


Cheers
Hugh
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Re: Probable nova in Hercules mag 6.4 !

Postby Christophe Boussin » Sun Jun 13, 2021 3:16 am

Hello all,

Here is my spectrum of the Nova Her 2021 obtained the 13th of June at 1 h 01 TU (resolution of 531, JJ = 2459378.5425) with my Alpy 600 and an acquisition time of 30 min (6 x 300s) :
_novaher2021_20210613_043_Christophe Boussin_3700_7565.png
Nova Her 2021 on June 13th, 2021
_novaher2021_20210613_043_Christophe Boussin_3700_7565.png (111.45 KiB) Viewed 1982 times

Clear skies to all !!

Christophe BOUSSIN
CBO (Newton 200 F/5 / Alpy600 / Atik 314L+ / Atik Titan + Mewlon 180 F/12 / LHIRES III 2400 / Atik 460EX / Atik 314 L+) @ ARAS database
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Re: Probable nova in Hercules mag 6.4 !

Postby Francois Teyssier » Sun Jun 13, 2021 7:51 am

Very fast nova.
Impressive spectrum.
Rapid evolution of spectrum is expected.

Page created in the new database : https://aras-database.github.io/database/novaher2021.html

François Teyssier
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Re: Probable nova in Hercules mag 6.4 !

Postby Joan Guarro Flo » Sun Jun 13, 2021 5:24 pm

Hello,

That is the Nova Her 2021, from the NOU_T echelle from SMM.

Regards, J.Guarro.
Attachments
NOVA Her 2021-1.jpg
NOVA Her 2021-1.jpg (127.86 KiB) Viewed 1898 times
NOVA Her 2021-2.jpg
NOVA Her 2021-2.jpg (82.38 KiB) Viewed 1898 times
NOVA Her 2021-3.jpg
NOVA Her 2021-3.jpg (88.52 KiB) Viewed 1898 times
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Re: Probable nova in Hercules mag 6.4 !

Postby Stephane Charbonnel » Sun Jun 13, 2021 6:14 pm

Hello,

A spectrum among the three taken yesterday during the night with my ESHEL from Shelyak :
Resultat_NovaHer.png
Spectrum R=11'000


An image of the field (the object is in the hole and very bright) :
Champ_Spectral_Nova_Her.jpg
Le champ spectral
Champ_Spectral_Nova_Her.jpg (127.8 KiB) Viewed 1886 times


Must be followed.

Is it always a probably nova or are we sure it is a nova ?

Stéphane
Last edited by Stephane Charbonnel on Sun Jun 13, 2021 6:19 pm, edited 2 times in total.
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Re: Probable nova in Hercules mag 6.4 !

Postby Robin Leadbeater » Sun Jun 13, 2021 6:16 pm

Joan Guarro Flo wrote:Hello,

That is the Nova Her 2021, from the NOU_T echelle from SMM.

Regards, J.Guarro.


Beautiful !
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Re: Probable nova in Hercules mag 6.4 !

Postby Francois Teyssier » Sun Jun 13, 2021 10:54 pm

Is it always a probably nova or are we sure it is a nova ?


The spectrum is not usual. It looks like a supernova.
Very fast nova, fast velocity and probably fast evolution.
Thus, massive white dwarf.

A similar spectrum: Nova Sct 1991, probably taken a few days after the maximum (emission components stronger than in the spectra secured last night).

Sct1991.PNG
Sct1991.PNG (23.41 KiB) Viewed 1829 times


See also V1500 Cyg (Nova Cyg 1975)

Raw spectrum (ongoing acquisition)

NovaHer2021.PNG
NovaHer2021.PNG (131.58 KiB) Viewed 1829 times


Very broad Balmer emissions.
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Re: Probable nova in Hercules mag 6.4 !

Postby David Boyd » Sun Jun 13, 2021 11:44 pm

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

David

novaher2021_20210613_928_D_Boyd.png
novaher2021_20210613_928_D_Boyd.png (19.49 KiB) Viewed 1822 times
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