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Recurrent Nova RS Oph

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garypoyner's picture
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Recurrent Nova RS Oph

There are reports that the recurrent Nova (NR) RS Oph is in outburst on the evening of Aug 8 at mag 5, having been at magnitude 11.2 on Aug 7 (of course, it's cloudy in Birmingham).

RS Oph last went into outburst in 2006.  Observations of all types are urgently requested by the BAAVSS.  BAAVSS charts can be downloaded from here or AAVSO charts from here.

EDIT. Aug 09 00:41UT.   The outburst has now been confirmed by several observers.

Gary

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Here is a VSS light curve

Here is a VSS light curve from the 2006 eruption:

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Faint on 2021-08-04T22:49:04Z

I measured it at V=11.016 ± 0.005 at JD 2459431.4507

It's been cloudy ever since. Unusual in these parts for this time of year.

Perhaps tonight ...

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spectra from 2006

A series of spectra from 2006 taken using a Star Analyser. 

http://www.threehillsobservatory.co.uk/astro/spectra_24.htm

I expect there will be many more spectra this time

Cheers

Robin

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RS Oph 2021 Outburst
We performed some follow-up of RS OPHIUCHI 2021 outburst through a TEL 0.1-m f/3.6 astrograph + CCD located in the Heaven's Mirror Observatory, Australia (MPC code Q56) and operated by Telescope Live network.

On images taken on August 09.42, 2020 we can confirm the presence of an optical counterpart (approximate R-filtered magnitude about +4.8; images were saturated in 10-second exposures) at coordinates:

R.A. = 17 50 13.20, Decl.= -06 42 28.2

(equinox 2000.0; UCAC4 catalogue reference stars for the astrometry).

Our image is available here: https://tinyurl.com/rsoph2021 or below

With kind regards,
Ernesto Guido, Marco Rocchetto & Adriano Valvasori

https://telescope.live/


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RS Oph 1 degree field

I've uploaded an image taken 1 hour ago to my community pages:

https://britastro.org/observations/observation.php?id=20210809_141707_eb...

Regards,

Martin

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Spectrum from Kyoto team

Atel 14838 from a team at Kyoto U report low resolution of RS Oph showing "Fe II, O I, and prominent Balmer lines. All of them listed here have a P Cygni profile. The velocity of the Hβ emission line is ∼ 2600 km/s. The profile and velocity indicate that this outburst is indeed a nova eruption, as is expected."

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RS Oph in outburst

Here is a spectrum of RS Oph in outburst taken tonight, 9th August, with a LISA. Very sharply peaked H-alpha line with FWZI of about 7000 km/s. Other Balmer lines similarly broad, all with P Cygni absorption dips. I don't remember seeing a spectrum quite like this before!

David

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unusual spectrum

This is only the start!  (The narrow unshifted feature comes from the circumsystem material from previous outbursts). If it follows earlier outburst there is lots more strangeness to come. Watch for highly ionised coronal lines (like [Fe X, XI, XIV]  and [A X] etc) produced as the shock heats the gas to 1 million K plus. There is an interesting account of taking spectra early in the 1958 outburst by George Wallerstein in the 2005 S&T article.

https://skyandtelescope.org/observing/celestial-objects-to-watch/when-wi...

Robin

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correction

"The narrow unshifted feature comes from the circumsystem material from previous outbursts"

Correction that should be  ....from interaction with the relatively slow moving red giant wind. This looks a good reference for the evolution of the optical spectrum in the 2006 outburst

https://academic.oup.com/mnras/article/474/3/4211/4768437

Robin

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Rs Oph

Visible without binoculars but only just through the light pollution from Newport and Cardiff. Patchy cloud and nova was going behind trees when a patch cleared sufficiently for me to get an observation in. Then I had to balance on top of a wall holding my 20x80's, our elderly neighbour seemed surprised! After 5 years living here she hasn't got used to an amateur astronomer living next door. I'll upload to database later.

Nice to see another bright Nova appear

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RS Oph evolution in relative flux

Amazing to have a hat trick of bright novae, and the latest such an anticipated event. The weather here in Somerset has been poor this last few weeks but in murky conditions I was able to capture RS Oph last night, just 20 minutes after Robin's spectrum in the BAA spectroscopy database. There is good agreement between our two spectra, both captured with an Alpy 600. Compared to David's spectrum from the previous night (higher resolution LISA spectrum), there has been a significant increase in the relative intensity of the emission lines but is this due mostly to a decline in brightness of the nova?

Cheers

Hugh

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Echelle spectrum

There is an absolutely stunning high resolution  echelle spectrum covering 3750-9300A in the BAA database from Joan Guarro Flo taken 20210809.838 using an amateur designed (by Tim Lester) home built remotely operated instrument. (zoom in to view the narrow P Cygni lines from the stellar wind superimposed on the broad nova ejecta lines)  An impressive example of the progress in amateur spectroscopy since the last outburst.

Cheers

Robin

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[Borat]Very nice[/Borat]

That is very impressive!  I also love how the vibrational structure of the telluric molecular bands is so well resolved.

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RS Oph SA100

A nice clear evening came along just at the right time much to my surprise. Some fascinating links and images on this page. Thanks to all 

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Still bright, but on the turn

Still bright, but on the turn. Do try and observe if you can.

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Spectrum from 10th

Here is my attempt at RS Oph on the night of the 10th using my C9.25 and Lhires III (23 micron slit) to collect nine 60 second images,chose Vega as my reference star. 

 Alun

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It looks like we may FINALLY

It looks like we may FINALLY get some clear skies here tonight- looking forward to making a magnitude estimate of it!

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Spectrum last night

Acquired another spectrum last night (12th) using Lhires III and C9.25. Acquisition time of 21 minutes (7x180sec) with 23 micron slit.

   

    Alun

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RS Oph in outburst

The continuum flux level of the spectrum is dropping as the magnitude fades, V=4.88, 5.44, 6.24 for the 3 spectra below.

In answer to Hugh's question above about the changes which have been taking place in the Balmer emission lines, I have posted information about this on the ARAS Forum at 

http://www.spectro-aras.com/forum/viewtopic.php?f=36&t=2804&start=30#p15940

David

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Finally saw it- I used my

Finally saw it- I used my 10x50mm finder last night, I made it magnitude 6.3

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Got it - the clouds finally cleared!

Me too Paul - following a string of cloudy nights since the outburst, the clouds finally parted. I made it mag 6.4 last night at 21:47 UT in 11x80B

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Clear here last night !

Clear here last night !

Lhires lll 23 micron slit 2400 l/mm grating C14 Atik460 1 x 600s.

Jack

Essex UK

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RS Oph last night

 Last night's attempt at RS Oph using Lhires III with 35um slit and 2400l/mm grating. Five 300 second subs captured through C9.25.

   Alun

  

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Last night Lhires111 23

Last night Lhires111 23 micron slit 2400 l/mm grating C14 Atik460 10 x 600s.

Jack

Essex UK

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Interesting evolution !

Last night Lhires111 23 micron slit 2400 l/mm grating C14 Atik460 3 x 600s. 

Jack

Essex UK

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Munari and Valisa have

Munari and Valisa have published an article on "The 2021 outburst of RS Oph. A pictorial atlas of the spectroscopic evolution: the first 18 days" on ArXiv today.

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A beautiful example

A beautiful example of what can be achieved with high quality equipment and very compliant weather!
David

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Updated LC

Please continue to observe RS Oph - the eruption continues:

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Observations.

I'd love to.  My last attempt was 2021-09-01 and taken through thin cloud.  Not so thin, actually, as I needed several 1-minute exposures to get anything measurable.  It would normally take a single exposure of somewhere between 2-5 seconds.

Clouds even thicker since then with the same forecast for several days.  I hope UK observers have better luck.

The 2021-09-01 observation will be processed and uploaded RSN, honest guv.

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What is the cause of the

What is the cause of the narrowing of the ha line?

Jack

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Growth of high ionisation coronal emission lines

Due to collision shock between the white dawrf nova explosion and red giant wind, the growth of very high energy coronal emission lines in the RS Oph spectrum now appears to be in full swing. Would others agree with my identification of these lines in the attached comparison?

Cheers

Hugh

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Line identification

Hi Hugh,

Looks good. I identified the coronal lines lines in a 2006 Star Analyser spectrum using this reference

This time round I've used ISIS to make a little animated gif (attached) showing the [FeX] line emerging based on 4 observations between 25th Aug and 11th Sept

Cheers 

Robin

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Paper on H-alpha spectroscopy
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Declining, but not at minimum

Declining, but not back at quiescence (minimum) yet.

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My latest spectrum

My latest spectrum showing interesting changes.

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No accretion disc

An ATel published yesterday reports that flickering in the light curve of RS Oph ceased during September: https://www.astronomerstelegram.org/?read=14974

This suggests that the recent nova eruption destroyed the accretion disc, as was found following the previous eruption. in that event,it reappeared after 240 days.