janvier 2012

Je m'amuse toujours avec la camera ultra grand champs. Des angles differents, pendant de longues heures d'observation sur deux nuits pour epier le ciel et le télescope.

Following the HeII4686 and the HeI5876 here is the study of the HeII5411 line of the wolf rayet star WR134. I present a time serie of three spectra taken during a total exposure of 2H40, with 2X1h spectra and 1X40minutes for the last one. small active absorption features are readily visible at the top of the line and transient emission line appears at Vr 2200km/s.  SNR of a 3600s exposure is around 110 at 5471A, Resolving power is 12000, dispersion 0.1A. All spectra are corrected from instrumental response on... [Lire la suite]