spectro-aras.com

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

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/ ... 38031.html

Spectra are welcome for identification.

Hi François, yes, that is another dwarf nova!



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



Lhires III slit view:



I send you FITS profile.

Ciao,
Paolo

PS: I miss a classical nova...

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. Slit view is distorted toward edges due to f/4 (fov can be roughly 20").

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

François

Hello all,

Here is my contribution on PNV J03093063+2638031
Regards,

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!



Updated AAVSO light curve:



Paolo

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:



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

Paolo

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:



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

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,