Nova Cep 2013

Nova dans Céphée

Postby Francois Teyssier » Sat Feb 02, 2013 5:55 pm

Une nova vient d'être découverte dans Céphée
Mag 10.3



PNV J23080471+6046521

PNV J23080471+6046521 2013 02 02.4119* 23 08 04.71 +60 46 52.1 10.3 U Cep N 0


2013 02 02.4327

Koichi Nishiyama, Kurume,Japan and Fujio Kabashima, Miyaki,Japan report a discovery of possible nova (mag.= 10.3) in Cep on two 40-s unfiltered CCD frames taken around 2013 Feb. 02.4119 UT ( limiting magnitude=13.5 ), using a 105-mm f/4 camera lens (+SBIG STL6303E camera). We have confirmed immediately the appearance of our discovery this PN on five 3-s unfiltered CCD frames taken around 2013 Feb 02.4327 UT ( limiting magnitude=17.5 ), using a Meade 200R 0.40-m f/9.8 reflector (+SBIG STL1001E camera). (lens magnitude of referred catalogue Hipparcos, others reference catalogue GSC-ACT) Nothing is visible at this location on two past survey frames taken on 2013 Jan 23.411 UT(limiting mag.= 13.6) and 26.401 UT (limiting mag.= 13.6) nor on 2MASS,USNO-B1.0, but prediscover mag=11.9 Jan. 28.412 UT ( limiting magnitude = 13.7 ),. mag=11.0 Jan. 30.413 UT ( limiting magnitude = 13.5 ),. We have checked in Minor Planets. nearest star in USNO B1.0 has position end figures 04s17, 59"9, distance 8".7, magnitudes B2=17.23 R2=15.98 I=14.65



http://www.cbat.eps.harvard.edu/unconf/followups/J23080471+6046521.html


Spectre Okayama University of Science Astronomical Observatory

Nova_Cep_2013.PNG
Nova_Cep_2013.PNG (60.49 KiB) Viewed 11431 times



François Teyssier
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Re: Nova dans Céphée

Postby Christian Buil » Sun Feb 03, 2013 8:48 pm

A spectrum of nova Cephei 2013 taken with LISA spectrograph + C11 (cloudy conditions - not easy),
the Feb. 3.746 UT

Image

The field image:

Image

(personnal page about the object: http://www.astrosurf.com/buil/nova_cep2103/obs.htm)

Christian Buil
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Re: Nova dans Céphée

Postby Paolo Berardi » Tue Feb 05, 2013 12:25 am

Thank you for the alert François. Christian was very responsive (as usual), immediately took an excellent spectrum!
This is my attempt of 4.766 february with Lhires III, 600 l/mm grating and 35 micron slit.

Image

Spectrum profile in fit format:
http://quasar.teoth.it/html/spectra/_no ... 04_766.fit

Ciao!
Paolo
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Re: Nova dans Céphée

Postby Francois Teyssier » Tue Feb 05, 2013 9:41 pm

Excellent, Paolo !
P Cyg profiles are evident.
Curent mas is 11.2 in V band according AAVSO data.
Cheers
François
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Re: Nova dans Céphée

Postby Christian Buil » Tue Feb 05, 2013 11:48 pm

I agree, your spectrum Paolo is excellent and
show clearly the Halpha profile (for a V=11.2 star...)

The actual status from Toulouse is rain, rain and rain :(

Christian B
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Re: Nova dans Céphée

Postby Paolo Berardi » Wed Feb 06, 2013 11:09 pm

Thank you François and Christian. Hope is ok to continue in this forum section (if it's to be used only for alert first messages, please tell me).

I just completed another observing session. I found a much lower continuum level in ADU counts and SNR (I don't know actual nova magnitude value, yesterday seemed to be stable) and a greater difference between peak and continuum. I could be wrong but I do not think that depends on the atmospheric status because in the same exposure time, beta_per spectrum shows about the same level on 4 and 6 february. Atmospheric turbulence was today only a little more intense.

Anyway, this is the 6.759 feb spectrum:

Image

Below a comparative graph of 4 and 6 february profiles.

Image

Fit profile:

http://quasar.teoth.it/html/spectra/_no ... 06_759.fit

I hope the weather will have allowed you to observe. It would also be useful to make a comparison.

Ciao
Paolo
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Re: Nova Cep 2013

Postby Francois Teyssier » Sat Feb 09, 2013 7:38 am

2 hours without clouds and a spectrum


Image

Strong enhancement of Balmer and Fe II emission lines.
Comparison between 03-02 and 08-02 spectra
novacep_comparison.png
novacep_comparison.png (4.96 KiB) Viewed 11340 times



I opened an Aras page dedicated to Nova Cep 2013 :

http://www.astrosurf.com/aras/novae/Nova2013Cep.html


François
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Re: Nova Cep 2013

Postby Christian Buil » Sat Feb 09, 2013 10:35 am

Here my version of the spectrum taken the last night, nearly the same date
of Francois !

Image

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Re: Nova Cep 2013

Postby Robin Leadbeater » Sat Feb 09, 2013 3:32 pm

This is how it looked with the Star Analyser on 2013-02-06. The spectrum in the far red beyond H alpha looks interesting but would need to be checked for interference from the second order of course.

(It was a first test after an observatory rebuild and it looks like I have some more work to do on collimation)

Cheers
Robin
Attachments
Nova_Cephei_2013_20130206.jpg
Nova_Cephei_2013_20130206.jpg (49.78 KiB) Viewed 11328 times
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
http://www.threehillsobservatory.co.uk
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Re: Nova Cep 2013

Postby Robin Leadbeater » Sat Feb 09, 2013 3:36 pm

Does anyone know what the 74 next to the Fe lines in the confirmation spectrum means ?
download/file.php?id=785

Cheers
Robin
LHIRES III #29 ATIK314 ALPY 600/200 ATIK428 Star Analyser 100/200 C11 EQ6
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