Amateur Astronomical Spectroscopy Olivier Thizy

93 Pages·2011·7.33 MB·English

AAmmaatteeuurr
AAssttrroonnoommiiccaall Olivier Thizy
[email protected]
SSppeeccttrroossccooppyy
---
May 7th, 2011
-- ATT / Essen ; Germany --
the “menu”...
• Equipment overview
• Educational
• Pro/Am projects
Equipment
07/05/11 (c) 2006 - Shelyak Instruments 3
Equipment
Professional:
eShel is an off-the-shelf optical
fibre fed echelle spectrograph
for higher RV accuracy and
productive spectroscopy
Study:
Lhires III (high resolution) and LISA
(low resolution) are exploration tool
allowing pro/am collcollaboration
Share your passion:
Lhires Lite visual spectroscope for public outreach
Discover spectroscopy:
The Star Analyser is the simplier spectroscope, ideal to get started
07/05/11 in this field with (lcim) 2i0te06d -b Suhdelgyaekt Instruments 4
Spectral Resolving Resolution Slit RV Limit
Domain Power R (500nm) mag
eShel 430-710nm >10000 0.5 A 50µm 50 m/s ~10
F/6
Lhires III Visual ~17000 0.3 A 15- ~3 ~9
(window of with 35µm km/s
~10nm) 2400 F/10
gr/mm
grating
LISA 390nm- 600-1000 5 A 15- n/a ~16
1µm 35µm
F/5
Star Analyser Visual ~100 50 A No slit n/a ~15
07/05/11 (c) 2006 - Shelyak Instruments 5
Applications
eShel High level education
Bright stars line profile (Be stars, pulsations...)
Abundances, classification
Spectroscopic binaries & exoplanets
Lhires III (self) education with low / medium / high resolution modes
Stellar classification
Bright stars line profile (Be stars, eps Aur, Wolf-Rayet, Slow
Pulsating B stars, Herbig Ae/Be...)
LISA Education: lamp, classification, nebulae, galaxie redshift...
Faint variable stars: cataclysmics, novae, mira...
Comets classification
Asteroids classification
...
Star Analyser Education: star temperature & classification
Novae
Faint variable stars
Supernovae
07/05/11 (c) 2006 - Shelyak Instruments 6
In practice: in the field
At the telescope
(autoguiding)
Control room
-spectrograph
-calibration unit
07/05/11 -PC & observe(rc :)- 2)006 - Shelyak Instruments 7
From image to profile...
Stellar 2D spectrum
Slit
Spectral profile
C. Buil
Diffuse objet spectrum (ex: sun)
Calibrated spectral profile
Educational projects
Spectroscopy ?
Light from the stars gives us information on:
• Their temperature [overall profile]
• composition and physical conditions of
excitation and ionization (ie temperature) [visible
lines]
• quantitative chemical composition (abundance),
pressure, gravity [line intensity and shape]
• movements [Doppler effect]
radial velocity
●
rotation
●
expansion
●
07/05/11 (c) 2006 - Shelyak Instruments 10