Nova Cyg 2014 = PNV J20214234+3103296

[Francois Teyssier]

Tonight spectrum

[OI] 6300 intensity is now near H béta

_novacyg_20140703_029_fteyssier.png (5.12 KiB) Viewed 6226 times

AAVSO LC

NovaCyg2014_AAVSO.PNG (22.5 KiB) Viewed 6226 times

Francois

[Christian Buil]

Another observation for the date of July 3.01
(C11 + MEDERS spectrograph - R = 2200). The full spectrum is taken in two parts (one hours exposures each).

Note complex Na interstellar lines. Also faint and fine emssion line at 5461 A.



Details





The MEDRES spectrograph:



Christian

[Kevin Hearst]

This is my first posting of spectra results. I am dealing with learning the processing, having a hard time learning and using ISIS. Not a problem with ISIS, just a problem of me using it. Currently I used MaxIm DL for camera control, CCDSoft to process, and then bring it into Vspect. I wanted to compare my data collection and processing results to the experienced members. Am I close in identifying the emission lines, not sure about the CA at 6295, or could it be FE or I.

[Martin Dubs]

Hi Kevin,

your spectra processing with ISIS looks good. For the identification of the lines check this introduction to Novae (use Google to translate):
http://www.astronomie-amateur.fr/Projet ... Novae.html
The line you see at 6295 A is the 6300 A [O I] line, prominent in Fe Novae. As a forbidden line you may not find it in all line catalogs. With the given reference above you will also be able to identify the other observed lines. Also of help is to study the discussions in this forum on Nova Del 2013.

Regards,

Martin

[Terry Bohlsen]

Kevin
You will get use to ISIS. I find it very simple now.
I did notice that you are using 600sec exposures on your C14. Just check that the Ha line isn't saturating on the original images as this will give incorrect line strength. This is only a problem with strong emission line spectra. For V1369 Cen that is now about V=8 I can't go above 15 sec exposures with my C11 before I reach saturation.

Cheers
Terry

[Francois Teyssier]

I find it very simple now.

Me too : *NOW* The learing curve is somewhat hard and the first attemps are difficult.
But, when you get experienced, this is *the* perfect soft for treatment. VSpec should be reserved to analysis (very good for that task). Sometimes to times Christian and Valerie envisage a fusion of the two softs, but I don't know if this new soft will arrive before the AAVSO spectroscopic data base

The identification of Martin is correct and also the advice of studying published spectra.
Williams publications (between 1991 and 1944, withe the Tolelo survey are very interesting)

NaI D is blended with He I 5876
"6358" is the second line of [OI] doublet (lambda = 6363) : the two lines always appear simultaneously (with a ratio of about 3) : if one is missing the identification isn't correct
"6156" is one of the numerous Fe II lines
OK for OI

Idenfication of lines doesn't result of a lecture of a table but needs a comprehensive study of the physics of the object and line formation.
Be carefull with soft which produces list of lines ; the lists must be considered as an help, noting more.

You have to add the ionization state (I for atom, II for singly ionized ion, III and so on)

As Martin said, you have description of the spectrum evolution in the pages about nova del 2013 : http://www.astrosurf.com/aras/novae/Nova2013Del.html:
and in ppt : http://www.astronomie-amateur.fr/Docume ... 02013.pptx

Bonne continuation

Francois

PS : congratulation for your spectrum, the target is not easy fora 300 l/mm on a Lhires. I should be glad to add it to the data base (francoismathieu.teyssier@bbox.fr)

[Kevin Hearst]

Martin, Terry, and Francois,

Thank you for the help and support. Operation of my equipment is the easy job. Taking the data and making sense of it is the hard work. Many steps to learn. I will have eight nights of observation since June 29th. Going out again tonight. Thank you again the the novae information it helped me to understand the stages. I have much more to learn, but I see how rewarding it is to see your own results, to share with others, and to have others help you making you better.

Clear skies, with many photons,
Kevin
http://www.hearstobservatory.com

[Olivier GARDE]

A comparison of the evolution of this nova between 25th and 30th July
Spectra taken during OHP workshop with a LISA and C14.

[Paolo Berardi]

My last observation for august 4.888. Lhires III 1200 and photometric slit, R~6000. I used two Miles reference stars, HD 176301 and HD 196544 (when it reached the same target height). Data reduction with 5 spectra (using narrow and wide slit). I combined with average the coefficients (very close values) for both Miles stars. I hope the entire procedure was correct...



I should adapt the spectral range to include the [O I] 6300 line...

Paolo

[Tim Lester]

Nova Cyg on Aug 11.1 calibrated for flux using the Miles reference HD190603.
Only narrow (2.3 arc sec) slit used but the seeing was good (1.8 arc sec) and consistent. Resolution ~ 1600.
V magnitude from the spectrum using the Bessel function = 12.16



Tim