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Hello Jacques, Oui le LISA a déjà bien pris du service, je ne suis amusé avec quelques Be, une NP extrêmement faible, la comète du moment,…je l’ai déjà équipé d’un module SPOX pour gérer les sessions à distance (50m :D). Le premier focus que j’ai fait était plutôt très bon (ISIS me donnait une résol...

Replying to myself

After checking carefully some pixels values, the offsets and dark are subtracted.

Bonjour, J'ai un soucis avec la conservation des mots-clés dans ISIS 6.1.4: Je démarre avec des brutes au format FITS dont les entêtes sont assez complètes, suffisemment en tout cas pour BeSS: 01 : SIMPLE = T /FITS header 02 : BITPIX = -32 /No.Bits per pixel 03 : NAXIS = 2 /No.dimensions 04 : NAXIS1...

Dear Rainer, Thanks for replying! Actually both spectra are obtained with the exact same focus. The difference is that the first one was obtained with a 15s exposure on a bright star , while the second one is obtained after 300s on a mv~9 Be star. The seeing was really poor and hence affected more t...

Dear all, I have recently bought a second-hand LISA in pretty good state, the idea behind is that for faint targets the 35um slit is better adapted to the 2m F.L. of my instrument than the 23um slit of the ALPY, considering the large variance of seeing that I have on my observation site. The first a...

Dear all, I have one question regarding the correction of the instrumental response. In the "Assistant réponse" there is a flat field image calculation. For what I understand the series of flat to be indicated is the raw one, i.e. not treated. Can you confirm that the dark/offsets are subt...

Dear all, I haven't posted for a long time and I'm currently slowly coming back to astro after a quite long absence. Yesterday was the first spectro night since about a year I think, and I started to point some Be stars, extracted from the ARAS-BeAM list of Be "to observe". One of the targ...

Très beau spectre! Ça fait plusieurs semaines que je lorgne sur cette comète mais la météo abusivement mauvaise…

Vu la vitesse angulaire de la comète le guidage est-il « Manuel » ou bien le suivi est il paramétré pour tenir compte des vitesses de la comète en DEC et RA?


Simon

My modest contribution for TCrB, taken a week ago with the N400 f5 and Alpy.

Just played a bit with the telluric lines removal using a simple polyfit to extract the low frequency spectrum and then the HF one which I use as a divider to the uncorrected NSV spectrum. The correction is done without any loss of resolution. The lower right plots are blurred *after* calculating th...