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Eruption of the Recurrent Nova RS Oph!


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RS Oph is entering an interesting new phase not seen in typical novae as the explosion crashes into the material surrounding the red giant, producing a shock wave which heats the material to very high temperatures. This produces highly ionised "coronal lines" in the spectrum, for example [Fe X] (Iron with 9 electron knocked out of it) shown here.  (Note the Y scale has been stretched massively to show these weaker lines. The peak intensity of the alpha line is well over 100 !).

rsoph_20210825-20210907_Leadbeater.png.883a225cb1097fa462817718466ae628.png

 I saw the same line appear in spectra taken around the same time during the previous outburst back in March 2006 Using a Star Analyser grating

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

 

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RS Ophiuchi
Using  the 25mm (x16), first impression – no colour.
Used the 12.5mm to darken the sky background a little more.
It is quite faint now. 
Fainter than HD162488 (7.98)
Similar in brightness to HD162215 (9.68) & HD162369 (9.56)
Brighter than HD162449 (9.81)
I estimated the Magnitude at 9.6.

I have enjoyed following this event. Although the OMC250 may have to be used more now :)

cheers

Ian 
 

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Yes, very faint, almost beyond my capability with a 50mm lens on a tripod.
Yesterday 20Sep, a race between dusk and it going behind a tree not helped by some thin haze and drifting thin clouds, surprised I got anything! A quick 40x2sec, DSS + a lot of stretch in Gimp but no added saturation, still a nice ruby red.
20Sep.thumb.jpg.20410b0fa165f7f5ad90e7857db4522b.jpg

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  • 3 weeks later...

I’m a total newbie so this is probably wrong but just spotted something close to where it would be, naked eye quite red and twinkling like a mad thing (when nothing around it was so not just weather). Took a good while to be convinced it was a not plane coming straight towards me. I know it was active in August as well and hadn’t been for years before, could it be going again? 

Clouded over now and close to horizon so I don’t think I’ll have a chance to see again tonight. 

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19 hours ago, sirenity said:

naked eye quite red and twinkling like a mad thing

Arcturus perhaps ?  Bright, orange  almost directly West (rather than SW for Ophiuchus) after dark currently. Low in the sky so twinkling due to the thickness of atmosphere we are looking through

Cheers

Robin

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