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Recurrent nova V3890 Sgr erupts again

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#1 Keith g

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Posted 28 August 2019 - 08:47 AM

Hi all the recurrent nova V3890 she has erupted for s third time. Details are here:

http://www.aavso.org...uption-67-mag-0

Keith..
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#2 theApex

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Posted 28 August 2019 - 11:37 AM

According to the same link, its eruption was roughly1.5 years overdue, according to its period.

As I managed to pinpoint it on Cartes du Ciel, I wonder if anyone has managed to do the same on Skysafari Pro, which I use exclusively for my observing sessions.


Edited by theApex, 28 August 2019 - 01:43 PM.


#3 robin_astro

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Posted 28 August 2019 - 01:48 PM

According to the same link, its eruption was roughly1.5 years overdue, according to its period.
 

Since there have been only two other recorded eruptions, perhaps it was the previous one that was early ;-)



#4 Aquarellia

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Posted 28 August 2019 - 05:01 PM

I did a visual estimation tonight 20190828 19h30 UT : +8.3, a quick fading?

Michel 



#5 Keith g

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Posted 28 August 2019 - 05:34 PM

I also done two observations this evening:

Aug 28.87 visual magnitude 8.2
Aug 28.90 visual magnitude 8.3

That roughly 1.5 magnitudes dimmer that 24 hours ago !
I must admit it was lovely to see this bright gem suddenly appear where I have been looking for years, a nice treat!

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#6 theApex

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Posted 28 August 2019 - 07:30 PM

And over here I may miss the best as it's going to be overcast for a few days. Yikes!

#7 robin_astro

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Posted 30 August 2019 - 10:11 AM

Some exquisitely detailed spectra and some notes by prof Steve Shore on the ARAS forum

http://www.spectro-a...php?f=36&t=2387

 

Robin



#8 theApex

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Posted 30 August 2019 - 02:34 PM

I finally got to observe it last night.

From the height of my still-budding experience with AAVSO charts* I concluded it to be mag 9.1 at 2019/08/30 00:49 UT


*Still at the R Scuti stage

#9 Keith g

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Posted 31 August 2019 - 05:16 PM

Hi all, I visually observed this recurrent nova tonight 2019 Aug. 31.88056 at magnitude 9.6

APM 120mm binoculars at x52. Its definitely fading, for now... let’s see what it will do

Edited by Keith g, 31 August 2019 - 05:17 PM.


#10 theApex

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Posted 02 September 2019 - 02:38 PM

fading, for now... let’s see what it will do

From what I've read in a scientific paper it should hold on to those higher-than-usual magnitudes for 2 months before fading into (relativel) oblivion again for the next 18 years or so.

From what its authors expected, the red giant is reverting to its previous state previous to its being ravished by the white dwarf's eruption - or something like that.

Edited by theApex, 02 September 2019 - 02:42 PM.


#11 Rich (RLTYS)

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Posted 02 September 2019 - 06:20 PM

My observation, this evening (9-2-19) of V3890 Sgr puts its magnitude at 9.9.



#12 Rich (RLTYS)

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Posted 06 September 2019 - 08:35 AM

V3890 Sgr is fading but rather slowly.

Attached Thumbnails

  • Lightcurve 9-6-19.png

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#13 FOUNTAIN1

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Posted 06 September 2019 - 02:57 PM

Attached is my attempt at recording this event. Since I am a novice to the subject of spectroscopy, especially at capturing spectra, and even less knowledgeable at knowing what I'm looking at, I've got some reading and learning to do. Here are some details from capturing the data:

 

Date: 9-2-2019

Telescope: AG Optical iDK 14.5"
Camera: ZWO ASI071 pro
Grating: SA 100
Software: RSpec
Exposure: (7) 300 second exposures
Elevation: Avg. was approximately 29.5 degrees

Spectrum Calibration: Vega Balmer line 4861 A
Focused on spectrum of star: HIP 90705 (A1IV) using the Balmer Line 4861 A. (This star was very near the target.)
Calibration Frames: Bias and darks (No flats were used)

 

Thanks for looking!

 

Glen

 

Attached Thumbnails

  • V3890 Sgr (White Bacground).png
  • V3890 Sgr w Balmer Lines (White Bacground).png
  • V3890 Sgr 35 Minute Cropped Email Version.jpg

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#14 robin_astro

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Posted 07 September 2019 - 03:56 AM

A beautiful result ! Good H and He lines. This is a great (and rather rare) target for the Star Analyser though too low for me :-(

 

The spectrum evolves fast but here is what the spectrum looked like last time 18 days after the eruption (from https://academic.oup...9/1/105/1004643 )

 

v3890Sgr_1990.PNG

 

The high ionisation (coronal) lines lines shown there can take a while to appear. Can you see  them in your spectrum ? 

 

Robin


Edited by robin_astro, 07 September 2019 - 03:57 AM.

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#15 FOUNTAIN1

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Posted 07 September 2019 - 09:56 AM

Thanks Robin! I read through the article you referenced and studied their graph/tables, and while some things lined up real close, others were just a bit off.  I attempted to label mine using their identifications at the same/close wavelengths.  I put a ? where I was less sure of the identification.  Additionally, I used the built-in identification lines inside RSpec to further assist as well.  What do you think?

Attached Thumbnails

  • V3890 Sgr Labeled.png
  • V3890 Sgr Labeled Hydrogen Lines.png
  • V3890 Sgr Labeled Helium Lines.png
  • V3890 Sgr Labeled Fe (I) Line.png

Edited by FOUNTAIN1, 07 September 2019 - 01:31 PM.

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#16 FOUNTAIN1

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Posted 07 September 2019 - 12:44 PM

Here is an animation (click on it to view) of V3890 Sgr 4 days apart.  (9-2-2019 & 9-6-2019)

Attached Thumbnails

  • V3890 Sgr Animation 4 Days Apart.gif

Edited by FOUNTAIN1, 07 September 2019 - 01:06 PM.

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#17 Rich (RLTYS)

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Posted 12 September 2019 - 06:25 AM

My latest observation of V3890 Sgr (9/10/19) puts the nova at mag 11.4, still slowly fading.


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#18 robin_astro

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Posted 14 September 2019 - 09:55 AM

I read through the article you referenced and studied their graph/tables, and while some things lined up real close, others were just a bit off.  I attempted to label mine using their identifications at the same/close wavelengths.  I put a ? where I was less sure of the identification.  Additionally, I used the built-in identification lines inside RSpec to further assist as well.  What do you think?

A list of lines identified by prof Steve Shore from amateur spectra as of 9-12th Sept has just been published

http://www.astronome...org/?read=13108

 

Robin


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#19 clintmk89

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Posted 30 September 2019 - 02:46 AM

Gonna have to look into spectroscopy sometime, seems very interesting!


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