Transcript CCD Spectroscopy - Institute for Astronomy

CCD Spectroscopy
Team Members:
Resident Astronomer:Dr. Aloha
Telescope Technician: Kurt Woolslayer
Instrumentation Specialist: Clyde
Kobashigawa
Equipment Needed
1. CCD Camera: SBIG ST-7E
$4K
2. Self guided Spectrograph:SBIG $4K
3. Telescope: 10”Meade LX50
$2.5K
4. Lap top PC:
$1.5K
5. Help from colleagues
$priceless$
CCD Camera coupled to
Spectrograph
CCD Camera coupled to
Spectrograph
CCD Camera coupled to
Diffraction
Diffraction
Spectrograph
grating
grating
Micrometer:
used to scan up
and down the
spectrum
Ray diagram of the optical system
1.Top Path:Imaging CCD
2. Right path:Guiding CCD
Telescope Setting and alignment
1. Setup wedge/tripod at 20 degrees.
2. Align finder scope with the optical tube.
3. Polar alignment
4. Find target object with eyepiece.
5. Remove eyepiece and focus with focuser attachment.
6. Attach Spectrograph/CCD/computer cables
7. Power up computer/CCD/begin cool down sequence.
8. Align slit,find target, focus target, and move target onto
the slit.
9. Grab and save bracketed images.
10. Warm-up and Power down equipment.
Exposures were captured at
different angles to the diffraction
grating to record the entire visual
spectra:
400 mm
450 mm
500 mm
550 mm
600 mm
Spectra of Mars
Spectra of Antares
Spectra of Spica
Spectra of Spica
Spectra of Mars
Spectra of Antares
Data reduction
1. Crop Spectra in CCD Software (CCDOPS)
2. Open target spectral data in spectral analysis software
(Spectra)
3. Open comparison spectral data
and calibrate absorption lines and emission lines.
4. Analyzed target data can be used to determine
the targets
A. Radial Velocities from Doppler shifts
B. Composition from absorption lines
C. Temperature from peak emissions and absorptions
D. Spectral class of target
CCDOPS
Software
with data
collected
from Antares
6/26/01
AntaresAntares
raw spectra
raw spectra
Cropped Antares Spectra
So What?
•Star Temperature by Spectral Classification
•Star Composition by Which Lines are
Present
•Star Motion by Looking at Doppler Shifted
Lines
Confirmation of planetary wobble
by Tau Boo
Happy Starry Rainbows !!!!!!!!!