Michel,Michel Verlinden wrote:Merci Olivier !
Tu es sûr de la vitesse d'expansion de la nova ?
Voici mon résultat sur 3 nuits consécutives.
Tout dépend ce que l'on prend en compte pour le calcul de la vitesse d'expansion ? Est ce uniquement le pic central ou au contraire toute la partie en emission ?
Je me posais la même question et voici un élément de réponse de la part de Steve :
"The central peak on all the strongest emission lines is identical, as you saw, I've never seen such a clean separation and it suggests that the system's at a very low inclination to the line of sight. My bet is that this is the accretion disk having survived the explosion but that's not clear. Whatever, it is identical on all lines and there's a high recombination ratio so it suggests that the narrow component may be low density (the redshifted emission in the Halpha is Halpha, not He I, that's separate and has the same profile as all the other He lines). HWZI = 4000 km/s, this i also consistent with the absorption on He I 5876 (weak but present, -3000 km/s) so this is an extreme case."