LRS (LOW-RESOLUTION SPECTROGRAPH)
**First
Light LRS Press Release**
- PI is Gary Hill, McDonald Observatory,
UT Austin
- CCD PI is Phillip MacQueen, McDonald Observatory,
UT Austin
- Rides on HET tracker at prime focus
- Grism-based with three modes: imaging,
long slit, and multi-object
- R = 600
to 3,000
- 400 to 1000 nm wavelength coverage in
two exposures at R = 1,000
- Also provides broad- and narrow-band imaging
over four arcmin HET FoV
- 30% throughput on the sky for spectroscopy
(absent slit losses)
- CCD is Ford Aerospace 3072 x 1024 device
with 15-micron pixels
- Optics partly constructed in Mexico at
IAUNAM
- Funded primarily by Stanford, Ludwig-Maximilians-Universität
München, and UT Austin
- Commissioned in Spring 1999
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Technical Details and Performance Data
- Recent References:
- Hill, G.J., et al., "The
Hobby-Eberly Telescope Low-Resolution Spectrograph,"
SPIE Conf. 3355, Kona, March 1998.
- Cobos D., et al., "The Hobby-Eberly
Telescope Low-Resolution Spectrograph: Optical Design,"
SPIE Conf. 3355, Kona, March 1998.
- Hill, G.J., et al., "The
Hobby-Eberly Telescope Low-Resolution Spectrograph: Mechanical
Design," SPIE Conf. 3355, Kona, March 1998.
MRS (MEDIUM-RESOLUTION SPECTROGRAPH)
- PI is Larry Ramsey, Penn State
- Fiber-coupled, located and bench-mounted
in spectrograph room in HET "basement"
- Dual-beam echelle and white pupil design
- R = 3,500
to 21,000
- Initial visible beam has 450 to 900 nm
wavelength coverage in one exposure
- Second beam will cover 900 to 1300 nm
in one exposure with capability to 1800 nm
- 10 multi-object fiber probes
- Fiber "long slit" and single
object fibers
- Optical fiber integrated field unit
- High wavelength stability
- 22% throughput on the sky
- Funded by NSF and Penn State
- Commissioning in Fall 2001
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- Recent Reference:
- Horner, S.D., et al., "The Hobby-Eberly
Telescope Medium-Resolution Spectrograph and Fiber Instrument
Feed," SPIE Conf. 3355, Kona, March 1998.
HRS (HIGH-RESOLUTION SPECTROGRAPH)
- PI is Bob Tull, McDonald Observatory,
UT Austin
- CCD PI is Phillip MacQueen, McDonald Observatory,
UT Austin
- Fiber-coupled, single object with sky
fibers
- Bench-mounted in insulated chamber in
spectrograph room in HET "basement"
- Mosaic of two R-4 echelle gratings and
white pupil design
- R = 30,000
to 120,000
- 420 to 1100 nm wavelength coverage in
two exposures, one octave in one exposure
- CCD is 4096 x 4096 Orbit CCD mosaic
- Better than 10 meter/second long-term
wavelength stability
- Low scattered light
- 15% throughput on the sky
- Funded by NSF and UT Austin
- Commissioning in Spring 2001
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Technical Details and Performance Data
- Recent Reference:
- Tull, R.G., "High-Resolution Fiber-Coupled
Spectrograph of the Hobby-Eberly Telescope," SPIE Conf.
3355, Kona, March 1998.
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