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Observing >> Variable Star Observing and Radio Astronomy

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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Possible nova in Aquila, 31 May 2013
      #5894977 - 05/31/13 08:19 PM

New possible nova PNV J19150199+0719471 in Aquila discovered by veteran nova hunter Koichi Itagaki, Yamagata, Japan. Mag 10.8 at discovery, several confirmations posted but needs a spectrum.
http://www.cbat.eps.harvard.edu/unconf/followups/J19150199+0719471.html
http://www.aavso.org/posible-nova-en-aquila

Cheers -

Rob


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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Re: Possible nova in Aquila, 31 May 2013 new [Re: RobK]
      #5895200 - 05/31/13 10:41 PM

Hmmm, B & V follow-up photometry by Enrique de Miguel suggests that it might be too blue to be a classical nova, possibly a dwarf nova?? This was posted to vsnet-alert by Taichi Kato.

Rob


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Rich (RLTYS)Moderator
Post Laureate
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Reged: 12/18/04

Loc: New York (Long Island)
Re: Possible nova in Aquila, 31 May 2013 new [Re: RobK]
      #5895602 - 06/01/13 07:56 AM

Rob, thanks for the info. Will try to observe this object if the weather cooperates.

Rich (RLTYS)


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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Re: Possible nova in Aquila, 31 May 2013 new [Re: Rich (RLTYS)]
      #5897701 - 06/02/13 12:11 PM Attachment (25 downloads)

Looking like it will be a dwarf nova but still awaiting spectrum. An early reported time series on it appeared to show evidence of superhumps. Anyway, I managed to image it tonight, very close to another star (dimmer) at this scale

Cheers -

Rob


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robin_astro
sage


Reged: 12/18/05

Re: Possible nova in Aquila, 31 May 2013 new [Re: RobK]
      #5900547 - 06/03/13 08:50 PM

Quote:

Looking like it will be a dwarf nova but still awaiting spectrum.
Rob




Hi Rob,

Here you go
http://www.spectro-aras.com/forum/viewtopic.php?f=5&t=607

Amateur spectra from a variety of locations including a team using IAC80 Tenerife for a campaign on WR stars, the centre of Paris and mine from NW England where it does not get dark at this time of year.

Robin


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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Re: Possible nova in Aquila, 31 May 2013 new [Re: robin_astro]
      #5900764 - 06/03/13 11:01 PM

Great job Robin!

Rob


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BrooksObs
professor emeritus


Reged: 12/08/12

Re: Possible nova in Aquila, 31 May 2013 new [Re: RobK]
      #5902126 - 06/04/13 04:18 PM

Further spectra indicates that the object is clearly a dwarf nova, probably of the UGWZ class. These objects, once thought to be excedingly rare, are being discovered in considerable numbers recently.

BrooksObs


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brianb11213
Postmaster
*****

Reged: 02/25/09

Loc: 55.215N 6.554W
Re: Possible nova in Aquila, 31 May 2013 new [Re: BrooksObs]
      #5902183 - 06/04/13 04:59 PM

Quote:

These objects, once thought to be excedingly rare, are being discovered in considerable numbers recently.



Yeah ... when the intervals between outbursts is measured in decades & the outbursts don't last long, it's going to take a considerable time of high quality survey work to find a significant proportion of them ... I guess the numbers are going up simply because the surveys are getting more complete, deeper & have been going longer.

"Exceedingly rare"? Well, maybe not, but the number visibly in outburst at any particular time remains small.


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Possible nova in Aquila, 31 May 2013 new [Re: RobK]
      #5906668 - 06/06/13 07:18 PM Attachment (15 downloads)

My pic from tonight May 6 below - on the Sloan DSS there's a faint blue star at this location

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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Re: Possible nova in Aquila, 31 May 2013 new [Re: nytecam]
      #5907364 - 06/07/13 06:33 AM

Nice job Nytecam!

Rob


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BrooksObs
professor emeritus


Reged: 12/08/12

Re: Possible nova in Aquila, 31 May 2013 new [Re: brianb11213]
      #5907799 - 06/07/13 11:47 AM

" 'Exceedingly rare'? Well, maybe not, but the number visibly in outburst at any particular time remains small."

No, exceedingly rare definitely was the proper term to use in regard to these stars for many decades. For most of my very long observing career with AAVSO only a handlful of these objects had been positively identified.

BrooksObs


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Rich (RLTYS)Moderator
Post Laureate
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Reged: 12/18/04

Loc: New York (Long Island)
Re: Possible nova in Aquila, 31 May 2013 new [Re: BrooksObs]
      #5909324 - 06/08/13 07:58 AM Attachment (13 downloads)

Took this image this morning 6-8-13 with the Slooh Remote Observatory.

Rich (RLTYS)


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Rich (RLTYS)Moderator
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Reged: 12/18/04

Loc: New York (Long Island)
Re: Possible nova in Aquila, 31 May 2013 new [Re: Rich (RLTYS)]
      #5912603 - 06/10/13 08:54 AM

I estimated this PNV at mag 11.9.

Rich (RLTYS)


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RobK
sage


Reged: 07/06/08

Loc: Bright, Vic, Australia
Re: Possible nova in Aquila, 31 May 2013 new [Re: Rich (RLTYS)]
      #5916340 - 06/12/13 04:35 AM

Now a CBET has been issued, officially confirming it as a dwarf nova.

CBET 3554 : 20130611 : DWARF NOVA IN AQUILA = PNV J19150199+0719471
http://www.cbat.eps.harvard.edu/cbet/RecentCBETs.html

Rob


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Possible nova in Aquila, 31 May 2013 new [Re: RobK]
      #5920956 - 06/14/13 05:18 PM Attachment (15 downloads)

My 60s pic in late twilight from last night June 13 @ 2200UT

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Rich (RLTYS)Moderator
Post Laureate
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Reged: 12/18/04

Loc: New York (Long Island)
Re: Possible nova in Aquila, 31 May 2013 new [Re: RobK]
      #5923391 - 06/16/13 08:49 AM Attachment (14 downloads)

Imaged PNV J19150199+0719471 last evening (6/15) with the Slooh Remote Observatory and it has definitely faded. I'd estimate its mag at 12.5.

Rich (RLTYS)


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Rich (RLTYS)Moderator
Post Laureate
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Reged: 12/18/04

Loc: New York (Long Island)
Re: Possible nova in Aquila, 31 May 2013 new [Re: Rich (RLTYS)]
      #5977381 - 07/18/13 07:58 AM Attachment (12 downloads)

Imaged PNV J19150199+0719471 last evening (7/16) with the Slooh Remote Observatory and it continues to fade. This dwarf nova has faded to about 16th magnitude.

Rich (RLTYS)


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nytecam
Postmaster


Reged: 08/20/05

Loc: London UK
Re: Possible nova in Aquila, 31 May 2013 new [Re: Rich (RLTYS)]
      #5979131 - 07/19/13 03:28 AM Attachment (10 downloads)

Hi Rich - thanks for the heads up. My unfiltered shot from last night I estimate mag ~16.9 against Sloan DSS [inset below].
The blue star seems a favoured candidate but is in the wrong place! - unless proper motion between epoch dates ie mine and Sloan. A second much fainter [mag 20?] candidate is marked but again is slightly displaced. Has a precurser been identified ?


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Rich (RLTYS)Moderator
Post Laureate
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Reged: 12/18/04

Loc: New York (Long Island)
Re: Possible nova in Aquila, 31 May 2013 new [Re: nytecam]
      #5979208 - 07/19/13 06:14 AM

It's definitely the brighter blue star. The AAVSO LCG shows this dwarf nova between 16th and 17th mag. It seems after my previous observation (6/26) the nova suddenly faded quite a bit.

Rich (RLTYS)


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