Possibile nova in Aries mag 11

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Possibile nova in Aries mag 11

Postby Paolo Berardi » Thu Oct 30, 2014 7:10 am

PNV J03093063+2638031

AR: 03 09 30.63
DEC: +26 38 03.1

http://www.cbat.eps.harvard.edu/unconf/ ... 38031.html

Nicely placed in the sky!

Paolo
Paolo Berardi
 
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Re: Possibile nova in Aries mag 11

Postby Francois Teyssier » Thu Oct 30, 2014 4:38 pm

Thanks for the Alert, Paolo,

According to Patrick Schmeer (snet-alert mailing-list) the object is
"probably a CV with large outburst amplitude (blue 18-19 magnitude star at
quiescence)".


http://www.cbat.eps.harvard.edu/unconf/followups/J03093063+2638031.html

Spectra are welcome for identification.
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Re: Possibile nova in Aries mag 11

Postby Paolo Berardi » Thu Oct 30, 2014 11:52 pm

Hi François, yes, that is another dwarf nova!

Image

Blu continuum, faint and narrow H-alpha emission, absorption of H-beta and H-gamma (at this resolution I don't see the possibile central emission peak), HeII 4686 just over the noise.

Progenitor should be visible in this animation I made with an old POSS2/UKSTU Red and an unfiltered image (21:58 TU 30 Oct) taken some minutes ago by Massimo Caimmi (thank you Massimo!). His astrometry: AR 03 09 29.77 DEC +26 38 04.6

Image

Lhires III slit view:

Image

I send you FITS profile.

Ciao,
Paolo

PS: I miss a classical nova... :roll:
Paolo Berardi
 
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Re: Possibile nova in Aries mag 11

Postby Peter Somogyi » Fri Oct 31, 2014 11:02 am

Fog allowed me this yesterday evening (+1 mag to stars...), red part is just noise and that's why Ha is not visible (have not cut at 6000A only for continuum). Anyway it's very blue.
Wanted to shoot more, but clouds dived in unexpectedly.
psnari.jpg
PNV J03093063+2638031
psnari.jpg (48.22 KiB) Viewed 6722 times
psnari_slit.png
psnari_slit.png (65.77 KiB) Viewed 6722 times

Slit view is distorted toward edges due to f/4 (fov can be roughly 20").
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Re: Possibile nova in Aries mag 11

Postby Francois Teyssier » Fri Oct 31, 2014 5:37 pm

That's excellent Paolo and Peter,
A page in the next newsletter.

François
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Re: Possibile nova in Aries mag 11

Postby Jacques Montier » Sat Nov 01, 2014 10:03 am

Hello all,

Here is my contribution on PNV J03093063+2638031

PNVJ03093063+2638031.png
PNVJ03093063+2638031.png (8.51 KiB) Viewed 6609 times


Regards,
--
Jacques Montier
Societe d'Astronomie de Rennes
IAU code J23
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Re: Possibile nova in Aries mag 11

Postby Paolo Berardi » Sun Nov 02, 2014 9:42 am

Hi all, I heard about the need to use higher resolution in case of weak (and narrow) spectral lines. So, I wanted to try a medium-high resolving power setup with h-alpha line of this subject. I don't know exactly what has changed in two days but yes, the emission line is much more detectable using 1200 l/mm grating (R~6000) instead of 150 l/mm one. Total exposure here is greater but I observe the same thing combining just some frames. I also understood that the emission line is very narrow, that is it does not show appreciable velocity broadening being its width close to my instrumental FWHM. This is very different from a classical nova!

Image

Updated AAVSO light curve:

Image

Paolo
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Re: Possibile nova in Aries mag 11

Postby Paolo Berardi » Mon Nov 03, 2014 6:12 pm

A similar experience for h-beta line. A noisy spectrum but the very narrow emission component is clear in the middle of the broadened absorption line:

Image

(cropped, entire spectrum includes 4580-5050 A interval)

Paolo
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Re: Possibile nova in Aries mag 11

Postby Paolo Berardi » Wed Jul 01, 2015 6:24 am

Hi all, I resume this old topic because it's just been published in the Astronomy and Astrophysics journal an interesting article by U. Munari et al. concerning the discovery of a photo-ionized spatially resolved nebula around the star:

http://arxiv.org/abs/1506.08526

It is interesting that the nebula seems appreciable also in the mid-res 2d spectrum I taken on 1.797 november 2014:

Image

I saw the extensions beyond continuum during the reduction process but I thought it was an effect due to a small vertical shift of the spectrum and the bright h-alpha "spot" (oscillations of target along slit axis).

Jacques, Peter, any evidence of the nebula in your spectra?

The article reports that a nebula around a WZ Sge star is probably a unique feature. There is a clear physical association to the dwarf nova because it expanded over time and it turned invisible when the superoutburst has ended (recombination completed). No evidence of the nebula in the historic red POSS plated.

Perhaps it could represent a possible interesting field of research also for amateurs.

Paolo
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Re: Possibile nova in Aries mag 11

Postby Jacques Montier » Wed Jul 01, 2015 9:20 am

Hi all,

Paolo, unfortunately, i don't see any evidence of nebula on my spectrum :(
Halpha is rather weak and does not clearly appear on the spectrum.

Peter ?

Regards,
--
Jacques Montier
Societe d'Astronomie de Rennes
IAU code J23
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