Search found 70 matches

by James Ley
Thu Feb 01, 2018 4:20 am
Forum: Spectra, results, information on activity ...
Topic: Beta Monocerotis
Replies: 7
Views: 6235

Re: Beta Monocerotis

I was able to process the spectrum of Beta Mon A with ISIS. Therefore this image is calibrated and corrected using 14 Lep as a nearby reference star. I think it is interesting to compare the single capture above with this average spectrum Duration : 726.0 secondes Resolution power : 516.3 Beta Mon A...
by James Ley
Wed Jan 31, 2018 4:39 am
Forum: Spectra, results, information on activity ...
Topic: HYDROGEN VARIATIONS IN OMI CET
Replies: 6
Views: 6292

Re: HYDROGEN VARIATIONS IN OMI CET

Hello Joan, I've lurked for a while on this website and have always enjoyed your spectra. I'm certainly no expert, but yes Mira variable stars are pulsating stars and their Balmer emissions vary with their pulsation phase. I found this recent article very good. Notice Figure 4 on page 5 that shows t...
by James Ley
Tue Jan 30, 2018 4:22 am
Forum: Spectroscopes and Softwares
Topic: CMOS vs CCD for spectroscopy applications
Replies: 17
Views: 16988

Re: CMOS vs CCD for spectroscopy applications

Voici 14 Lep (A3V) avec une reference. Resolution power : 516.9
14 Lep.png
14 Lep.png (16.91 KiB) Viewed 5510 times
Je suis nul avec ISIS. Je n'arrive pas à traiter mes autres spectres avec cette référence.
Je m'en vais retourner au Beginner's Corner...
by James Ley
Mon Jan 29, 2018 7:39 pm
Forum: Spectroscopes and Softwares
Topic: CMOS vs CCD for spectroscopy applications
Replies: 17
Views: 16988

Re: CMOS vs CCD for spectroscopy applications

Comparison of CCD ATIK460EX and a ZWO ASI178MM Cooled (Sony back side CMOS detector) Je présente ici un test comparatif (pas trop évident à réaliser) entre une caméra CCD classique (ATIK460EX) et une de ces nouvelles caméras à capteur CMOS (origine Sony) économiques de la marque ZWO, ici une ASI178...
by James Ley
Mon Jan 29, 2018 2:15 am
Forum: Spectroscopes and Softwares
Topic: A modification for improve eShel spectrograph
Replies: 113
Views: 114182

Re: A modification for improve eShel spectrograph

Pour ma part ces CMOS me laisse un peu perplexe à l'heure actuelle. Je ne m'y connais pas beaucoup mais il y a quand même pas mal d'inconvénients par rapport aux CCD : - dynamique moins importantes - pixels clignotants et aléatoires - darks à refaire si on utilise un gain différent - très sensibles...
by James Ley
Sat Jan 27, 2018 3:24 pm
Forum: Spectra, results, information on activity ...
Topic: Beta Monocerotis
Replies: 7
Views: 6235

Re: Beta Monocerotis

Hello Etienne, Oops I made some mistakes and you noticed. :oops: Because I wasn't sure how to separate the spectra of B and C with ISIS, I used RSpec. The spectrum of Beta Mon A is from one 80 s capture and the spectrum of B and C is from one 160 s capture. I made around 10 images of each. I also ca...
by James Ley
Sat Jan 27, 2018 1:33 am
Forum: Spectra, results, information on activity ...
Topic: Beta Monocerotis
Replies: 7
Views: 6235

Beta Monocerotis

Here are some spectra I took of the three components of the Beta-Monocerotis system. They are all Be stars with emission! A is separated from BC by 7.4” and B and C are separated by 2.8”. Here is the spectrum for A Beta Mon A.png When I took these spectra B and C were together on the slit of my ALPY...
by James Ley
Sat Jan 27, 2018 12:55 am
Forum: Introduction / Présentation
Topic: Salut de Miami / Hi from Miami
Replies: 4
Views: 4320

Re: Salut de Miami / Hi from Miami

Bonjour Etienne,
Ma caméra CMOS et mon télescope réflecteur sont très économiques. J'ai choisi la caméra pour les petits pixels. Elle ne m'a pas déçu. Il sera intéressant de comparer ses performances aux caméras CCD.
by James Ley
Sat Jan 27, 2018 12:36 am
Forum: Outbursts, Alerts, Monitoring
Topic: Mira in near UV---Outburst?
Replies: 10
Views: 11550

Re: Mira in near UV---Outburst?

My understanding is that emission around maximum light is due to shock waves in Mira type variables. The intensities of the Balmer emissions do not follow their typical nebular decrement. Here's a paper showing H-zeta and H-eta like in your spectrum. http://adsbit.harvard.edu/cgi-bin/nph-iarticle_qu...
by James Ley
Wed Jan 24, 2018 5:40 am
Forum: Introduction / Présentation
Topic: Salut de Miami / Hi from Miami
Replies: 4
Views: 4320

Salut de Miami / Hi from Miami

Bonjour à tous, J'ai déjà appris beaucoup de choses de ce forum. Je suis très heureux d'être un nouveau membre. J'utilise un spectrographe ALPY 600. A Miami le seeing est souvent très bon mais la pollution lumineuse est toujours très mauvaise. J'ai quelques spectres et beaucoup de questions. Merci d...