Study of a spectroscopic binary with amateur setup

Study of a spectroscopic binary with amateur setup

Study of a spectroscopic binary with amateur setup By David Antao David Antao started astronomy in 2001. In 2002 and 2003 he passed the CNED university diplomas, in Astronomy and Astrophysics. Long observer in visual, he begin spectroscopy in 2008, a field he knows...
A compact telescope shelter

A compact telescope shelter

A compact telescope shelterBy Olivier Garde & François Cochard The open shelter (photo : François Cochard) Having a fixed installation is a dream for many astronomers, amateurs as well as professionals. This is particularly the case in spectroscopy, because the...
Spectroscopy Whorkshop SMSW-2

Spectroscopy Whorkshop SMSW-2

Spectroscopy Workshop SMSW-2 By Olivier Garde   The second edition of the spectroscopy workshop SMSW-2 “Sacramento Mountains Spectroscopy Workshop”, was held in Las Cruces, New Mexico, on February 22nd, 23rd et 24th 2019 in the beautiful setting of...
Magnitude 17 with a LISA

Magnitude 17 with a LISA

Magnitude 17 with a LISA By Olivier Garde During a planetary nebula confirmation mission, we were able to use a LISA spectrograph on a 1m  telescope, the T1m “Epsilon” of the C2PU. The C2PU has 2 twin telescopes. One is named Omicron (West dome) and the...
Planetary nebulae confirmation

Planetary nebulae confirmation

Planetary nebulae confirmationBy Olivier Garde Recommanded equipment : Alpy, Lisa Time :  about 4 h For several years, amateur astronomers have been discovering probable planetary nebula candidates thanks to their own images or by scrutinizing professional surveys...
How to measure the redshift of a galaxy ?

How to measure the redshift of a galaxy ?

How to measure the redshift of a galaxy ? Recommanded equipment : Alpy, Lisa, Star Analyser Time : 1 to 4 h Low resolution spectroscopes are particularly well suited to the study of distant galaxies such as Seyfert galaxies or Quasars. We can easily calculate their...
Symbiotics stars

Symbiotics stars

Symbiotics stars Recommended equipment : Star Analyser, Lhires III, eShel, Alpy, Lisa Time : one night or a life time ! Summary Symbiotic stars are interacting binary red giant & hot stars. The red giant loose material which is accreted by the hot star (main...
Del Sco : 2011 campaign for periastron

Del Sco : 2011 campaign for periastron

Del Sco : 2011 campaign for periastron Be stars are hot, non supergiants stars whose spectra have shown or still show spectral emission in Balmer line – typically Halpha. Those emissions comes from material around the star – often an equatorial disk or...
Beta Lyrae – Shelyak !

Beta Lyrae – Shelyak !

Beta Lyrae – Shelyak ! Well… beta Lyrae is a special star for us as its arabic name is Shelyak, the origin of the Shelyak Instruments company name. Few years ago, we spent couple of week studying this star spectroscopically. This is a Be star (see article...
Be stars

Be stars

Be stars Recommended equipment : Lhires III, eShel, Lisa, Alpy Time : one evening to a life time ! Abstract Classical Be stars are non supergiant B-type stars that exhibit or have exhibit emission lines over the photospheric spectrum. This article review common...
Beta Aurigae spectroscopic binary

Beta Aurigae spectroscopic binary

Beta Aurigae spectroscopic binary Recommended equipment : Lhires III, eShel Time : several observing nights Summary Grâce à la haute résolution du Lhires III, il est possible de séparer de nombreuses étoiles binaires spectroscopiques. Ces étoiles, qui...
RV (Radial Velocity)

RV (Radial Velocity)

RV (Radial Velocity) Recommended equipment : eShel, Lhires III Time : 1 h  Stars are moving into space and their spectra appear shifted compared to the same lines in laboratory. Exemple here is SAO104807 which is moving toward us at a speed of 100 km/Sec and SAP112958...
Lithium star : 59 Vir

Lithium star : 59 Vir

Lithium star : 59 Vir Recommended equipment : eShel, Lhires III Time : one evening (acquisition) 59 Vir is a G0V type star, close to solar spectral type. But its spectrum display a stroing Li I (6708) absorption line. This star is rather young and lithium will...