[Aavso-photometry] Re: RS Oph

[Bernard Heathcote]

In case you haven't seen it, Christian Buil has his 14 Feb hi-res 
(0.12A/pix) spectra of the Halpha line at
http://www.astrosurf.org/buil/us/rsoph/rsoph.htm

Bernard Heathcote



----- Original Message ----- 
From: "Richard Huziak" <huziak at sedsystems.ca>
To: <aavso-photometry at mira.aavso.org>
Cc: "Gordon Sarty" <gordon.sarty at usask.ca>
Sent: Wednesday, February 15, 2006 6:04 AM
Subject: [Aavso-photometry] Re: RS Oph


> Gord Sarty (SGE) sent me this - but my spectrometer has a big wall to the 
> east that I can't see over, so I will not be able to obtain spectra of 
> this event until at least a month from now (thus likely not!)....  HUZ
>
> "RS Oph is in the T CrB class of CVs that consists of a giant M star with 
> high mass transfer rates (likely by stellar wind because Roche lobe 
> overflow would cause runaway shrinkage of the orbit). The high mass 
> transfer is what leads to the frequent novae. Also the white dwarf is 
> close to the Chandrasekar mass so RS Oph is likely to become a Type Ia 
> supernovae someday (not all accreted matter is blown away in the nova).
>
> The Balmer lines are in emission when RS Oph is in a non-nova state and 
> the Balmer line ratios (Balmer decrement) seem to be consistent with 
> photoionized-recombination emission from a nebula surrounding RS Oph left 
> behind from the frequent nova outbursts. (Regular novae don't **seem** to 
> have this feature.)  It would be interesting to see how the Balmer lines 
> change throughout the outburst."  (ref Warner's book).
>
> Any spectroscopists out there?  :-)
>
> -- 
>
> * * * * * * * * * * * * *
> Richard Huziak
> Manufacturing Engineering
> SED Systems
> Saskatoon, SK, Canada
> tel. (306) 933-1676
> <huziak at SEDSystems.ca>
> * * * * * * * * * * * * *
>
>
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