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Nova Del - jump in emission lines !

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#1 nytecam

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Posted 19 August 2013 - 03:40 PM

In dusk tonight (London UK) the emission lines of Ha and Hb and others have doubled in intensity over last night. Get those spectroscopes recording !

My uncalibrated spectra taken ~hour apart here and here ;)



#2 robin_astro

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Posted 19 August 2013 - 08:26 PM

Spectra from Australia by Terry Bohlsen
http://i566.photobuc...zps8c7c79ad.png
and later from France tonight by Francois Teyssier
http://www.spectro-a...ile.php?id=1043
fill in some of the gaps and show how this dramatic change progressed (The absorption part of the P Cygni profiles has disappeared)

Amateur collaboration on a global scale is really beginning to paying off with this one but there is still plenty of room for more observers.

Robin

#3 nytecam

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Posted 21 August 2013 - 10:05 AM

Here's my raw profiles for Aug 16, 18, 19 and 20 showing the rise of the emission lines at this stage since outburst :grin:

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#4 Rich (RLTYS)

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Posted 22 August 2013 - 05:30 AM

Cool. :cool:

Rich (RLTYS)

#5 nytecam

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Posted 22 August 2013 - 05:15 PM

Thanks Rich - here's toght's rising profile - Ha takes the lead :grin:

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#6 nytecam

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Posted 22 August 2013 - 05:51 PM

5 evening's results over 7 days below :grin:

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#7 7331Peg

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Posted 23 August 2013 - 12:29 AM

How are the jumps in H-Beta and H-alpha related to brightness? I see they've been steadily increasing as the nova's been dimming over the last few days, so is it safe to say there's an inverse relationship here? Or is something else involved?


John :refractor:

#8 nytecam

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Posted 23 August 2013 - 02:59 AM

How are the jumps in H-Beta and H-alpha related to brightness? I see they've been steadily increasing as the nova's been dimming over the last few days, so is it safe to say there's an inverse relationship here? Or is something else involved? John

John - I've used the 'peak' immediately right of H-beta as my reference in each case and scaled each nightly spectrum, under varying transparency and thus exposure, to the same point - effectively as the star's background continuum decreases as the nova fades, the emission lines become more prominent but the dominant effect is the rise in intensity of the emission lines themselves as the "fog" clears around the nova's atmosphere.

The question of "brightness" or magnitude is containtly raised [as one would expect for a VS Forum] but my spectroscopy [and others] are primarily interested in the development of the spectrum, independant of its brightness - hope that clarifies :grin:

#9 7331Peg

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Posted 23 August 2013 - 02:00 PM

Thanks -- that does help to clear up the "fog" just a bit, at least. I need to learn more about spectroscopy one of these days.


John :refractor:

#10 nytecam

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Posted 08 September 2013 - 01:58 PM

Here's the nova's starfield and normal profile [cyan] and expanded [purple] in 3s exp from Friday night Sept 6th - my tenth night of observation of its spectra. The nova is fading below naked eye visibility but the spectrum has settled down and essentially constant :grin:

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#11 NJScope

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Posted 09 September 2013 - 05:00 PM

Nytecam:

Very similar results were obtained last evening from Nova Del 2013 using a C8/DSS-7/ST402ME spectrometer. Halpha is really dominant but the other Balmer emission lines are still clearly evident.

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#12 old_frankland

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Posted 17 September 2013 - 04:19 PM

Excellent work, Maurice. Simply outstanding.

Which software do you use for plotting?

Keep 'em coming!

#13 nytecam

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Posted 17 September 2013 - 05:12 PM

Excellent work, Maurice. Simply outstanding. Which software do you use for plotting? Keep 'em coming!

Thanks - just SX Lodestar s/ware ["intensity plot of selected pixel row"], tweaked in PaintShopPro v4 imaging s/ware and MS Moviemaker Live s/ware for video ;)






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