Probable SN in NGC 6946

[Paolo Berardi]

Hi all, yesterday I also was able to observe the SN with Lhires III and 150 l/mm grating (R~600).



Robin, I have the same response as yours from Gelato: IIP some days later.





From AAVSO lightcurve I saw that blue magnitude has undergone a temporary variation, I don'w know if it may reflect the blue continuum drop in Etienne and Fran spectra.

The minimum of P-Cygni h-alpha narrow absorption is close to 6280A in my spectrum. It should correspond to about 13000 Km/s for the ejecta velocity. It seems to me that also H-beta shows the same P-Cygni profile. Another line could be the broad He I 5876 (overlooking the narrow Na D line).

Paolo

[Robin Leadbeater]

That is a very nice LHIRES spectrum Paolo. Worth the over 2 hours exposure !

A silly question. How do I display my graphs full size on the forum. Mine often only show part until they are clicked on

Cheers
Robin

[Martin Dubs]

Robin,

the cutoff of the graphs depend on screen size in Pixels, scale of display of your browser and graph size. For my notebook with a reasonable display scale a graph width of about 600 to 800 pixels appears complete. Right click on an image in the forum and choose Image info to find out about the size (in Firefox). In ISIS you can adjust the size of the spectra on the Gnuplot page. Camera images you can downsize to a reasonable width with standard image view software (I use oldfashiond IrfanView). It is annoying sometimes if people post 16 MBit images full scale.

Regards, Martin

[Robin Leadbeater]

Hi Martin,

None of my images are very large. To stop the images being cut off at the bottom I have to make them less than ~450 pixels high but there are many images in this thread much taller.

What do you see in my post here for example ?
http://www.spectro-aras.com/forum/viewt ... t=10#p8255

I see 3 out of the 4 images are truncated unless clicked on. They are smaller than many other images in this thread though. I see also that each image has information about it underneath which does not happen with Paolo's post here for example which has much larger images
http://www.spectro-aras.com/forum/viewt ... t=20#p8259

Cheers
Robin

[Martin Dubs]

Hi Robin,

in your post

viewtopic.php?f=5&t=1744&start=10#p8255

I see only the first image clipped in Firefox, three out of the four clipped in Edge browser.
In Paolos images, viewtopic.php?f=5&t=1744&start=20#p8259 no images clipped, the image info says e.g.

700px × 450px (Skaliert zu 581px × 374px)

I have no idea, why some images are scaled and others not.

Regards, Martin

[umberto sollecchia]

Félicitations Paolo, un excellent résultat.
Umberto

[Robin Leadbeater]

I have no idea, why some images are scaled and others not.

OK now I see the difference. Paolo (and Etienne's) images are held on their own sites and have links to them in their posts. These are not cropped. I (and Fran) have uploaded our images to the forum as attachments.

Cheers
Robin

[James Foster]

I've been imaging this SN candidate since Tuesday night (17May17), but I wasn't able to process my LISA spectra until I got a better focus btw the grating and 23 micron photometric slit.
The 17 & 18 May had degraded resolutions but I still was able to process them once I got a good IR curve on a nearby F4V star (HD157373) last night. Here is a 45 minute exposure on the SN candidate in NGC 6946 (Telluric Hg and O2 indicated):




James

[Robin Leadbeater]

Hi James,

I presume the Hg lines (and fainter Na D emission and other narrow lines) are from residual light pollution sky lines incompletely removed by the background subtraction ?

Robin

[etienne bertrand]

Paolo, Robin, James & Francisco congratulations for your goods spectra