Hi all!
I have a possibly somewhat narrow question. I'm interested in not just doing photometry on CVs, but also spectroscopy. I came upon the idea of exploring the characteristic double peaks of emission lines in CVs in quiescence, caused by the ackretion disc being limited in diameter (following Horne & Marsh, 1986, as also decribed in Warner's (1995) and Hellier's (2001) books.
Doing spectroscopy on CVs in quiescence is challenging as they are faint - so I started out with SS Cyg. High in the sky and relatively bright. However, I find no double peaked emission lines, not in my spectra and not in any high-resolution spectra I find captured by others. So my puzzle: is there no double peaks in SS Cyg? If now, how can we understand that - if they are caused by the ackretion disk, surely they would appear there as well...?
Any ideas on this is warmly welcome. I feel a bit confused.
Magnus