PNV J20233073+2046041 mag 6.8

[Martin Dubs]

Hallo,

the rising of the Balmer lines is indeed remarkable when comparing it to the continuum. It would be nice to plot the actual flux versus time. Not so easy for a complex spectrum with intense emission lines to convert magnitude into flux however. Maybe Christian has tried it? Whenever I suggest something, Christian has in most cases already done it

Regards, Martin

[Ernst Pollmann]

Martin,
good idea! Indeed this would make sense.
In this context see the essential part (page 2-3) of our AAVSO 2012 publication of the PCyg campaign, in which we study the intrinsic flux by division of the EW through Vmag:

http://astrospectroscopy.de/PCYG_AAVSO.pdf

To get contemporaneous Vmag values should be not a problem.

The derived quantity is not the line flux in physical units, but a quantity proportional to the physical line flux, corrected for continuum variations. It is important to consider the absolute flux of the line because its variations are caused by the effects of mass loss, stellar wind den-sity and changes of the ionization state of chemical elements in it.

Ernst Pollmann
----------------------------------------
Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete

[Robin Leadbeater]

S

Some variation (note a feature at 4385.5 A) but not CN line at 4216 A for the
moment.

Nothing at 3886A either yet

Cheers
Robin

[Ernst Pollmann]

In the context of Martin´s and my post (121&122) here a Vmag observation series of Ulrich Schmidt (Berlin-Association-of-Variable-Stars, BAV-Germany) as comparison to the 8mag star GSC 16432278.

Ernst Pollmann
----------------------------------------
Active Spectroscopy in Astronomy
http://www.astrospectroscopy.de
http://www.astronomie.de/astronomische-fachgebiete

[Robin Leadbeater]

Some variation (note a feature at 4385.5 A) but not CN line at 4216 A for the
moment.

Confirmed in my spectra on these nights (A small P Cygni feature appears in the difference at ~4381/4386 but nothing obvious at 4216)

Cheers
Robin

[Thierry Lemoult]

Just one very short observation tonight, in a small hole after rain.
4x90s, C14 + eShell. The H alpha is up du 18x the continium level now !

I post the data to Francois.
Regards
Thierry Lemoult

[Francois Teyssier]

Comparaison de différentes résolutions
H alpha
Le 19 08 2013

- Thierry Lemoult R = 11000 Bleu
- Paolo Berardi R = 2500 Violet
- François Teyssier R = 1000 Rouge
- Olivier Thizy R = 600 (décalé de + 2 A) Vert

_novadel_20130819.png (11.49 KiB) Viewed 11056 times

François

[Christian Buil]

J'ai traité des informations de mon observation du 24-25 (faite malheuersement sous pas mal de nuages).
On focalisant le spectrographe eShel dans le bleu (vers 4200 A), simultanément, on obtient un spectre bien net
du proche infrarouge.

Voici donc le spectre de la nova le 24.9 entre 6490 A et 8450 A (pose de 5 x 300 s avec le T200) :



Un détail de la raie OI à 7773 A :



et un zoom sur une raie en émission à 8115.3 A que je n'ai pas pu identifier :



J"ai mis à jour la page eShel-Extented pour le traitement des données infrarouge avec eShel :

http://www.astrosurf.com/buil/isis/eshe ... metres.htm

Christian

[Olivier Thizy]

Evolution of the nova - Halpha continues to rise...

nova.jpg (156.56 KiB) Viewed 11033 times

Cordialement,
Olivier Thizy
Vous ne verrez plus des étoiles comme avant !
http://www.shelyak.com/en/

[Jacques Montier]

Hello everybody,

Halpha spectrum of the last night with Lhires III 2400 t/mm and comparison with the 20130820 H alpha.
H alpha rising is very spectacular !

comparaison.png (6.38 KiB) Viewed 11009 times

Cheers,

--
Jacques Montier