Lhires III Spectroscope

5 100,00  incl. VAT - 4 250,00  excl. VAT

The Lhires III spectroscope is the king of High Resolution (R = 18,000). Shelyak’s historic instrument was designed to observe details in one (or more) spectral lines. It’s the ideal tool for working with the Doppler effect and observing star activity.

Complete your Lhires III spectroscope with the products below

Additional modules

Additional modules: technical specifications

Description
Shelyak ref.
Acc. type
Included
Comment
Integrated guiding module
Guiding module
Integrated calibration module
Calibration module
SPOX with 0.8m cable
ES0013
Other add-on modules
For remote control of flat and calibration lamps. Short cable for telescope installation.
SPOX with 5m cable
ES0012
Other add-on modules
For remote control of flat and calibration lamps. Câble long pour une utilisation à côté du télescope.

Grating module

Grating module : technical specifications

Description
Shelyak ref.
Included

R @650 nm

Dispersion (nm/mm)

Blaze

Grating module 2400 lines/mm for Lhires III
SE0005
18000
1,3
VIS (holographic)
Grating module 1800 lines/mm for Lhires III
SE0121
11000
2,2
500 nm
Grating module 1200 lines/mm for Lhires III
SE0006
5900
3,9
500 nm
Grating module 600 lines/mm for Lhires III
SE0007
2800
8,2
500 nm
Grating module 300 lines/mm for Lhires III
SE0008
1400
16,6
500 nm
Grating module 150 lines/mm for Lhires III
SE0009
700
33,3

 

500 nm

Slits

Slits : technical specifications

Description
Shelyak ref.
Included

Material (% reflexion)

Mirror size

AR coating

Comment
Multiple slit 15/19/23/35 µm
SE0116
Chromium (55%)
17 x 17 mm
400 – 700 nm
Slits 15, 19, 23, 35μm
Lhires III slit holder
SE0192
Add for each additional slit
Photométric slit 23/27/31/35 µm
SE0194
Chromium (55%)
17 x 17 mm
400 – 700 nm
23/200, 27/250, 31/300, 35/350μm
Wide slit 19/50/75/100 µm
SE0122
Chromium (55%)
17 x 17 mm
400 – 700 nm
Hole 19μm + slits 50, 75, 100 μm

Recommended guiding cameras:

Recommended cameras: technical specifications

Description
Shelyak ref.
Included

Acc. type

Cooled

 

Comment

Camera ASI174 mini
EL0244
Guiding camera
No
Uncooled camera, sufficient for most applications.
Caméra QHY174-MM Pro
EL0253
Guiding camera
yes
Cooled camera, for long exposures (>30 seconds). Only useful for low-resolution, faint targets.

Recommended acquisition cameras

Recommended cameras: technical specifications

Description
Shelyak ref.
Included

Acc. type

Cooled

 

Comment

Caméra Atik 414
SE0176
Science camera

Other accessories

Other accessories: technical specifications

Description
Shelyak ref.
Included

Acc. type

Comment
12V/7A power supply + 4-way cable
SE0133
Power supply
12V power supply (7A), to power several accessories (cameras, lamps, etc.). Supplied with 5m silicone cable and 4 connectors (2x 2.5 mm and 2x 2.1 mm)
Set of acquisition camera adapters: backfocus 13 mm
SE0110
Rings
For cameras with backfocus from 11 to 15 mm
Set of acquisition camera rings: backfocus 23 mm
SE0012
Rings
For cameras with backfocus from 21 to 25 mm
Set of acquisition camera adapters: backfocus 17 mm
SE0014
Rings
For cameras with backfocus from 15 to 19 mm
Set of acquisition camera adapters: backfocus 25 mm
SE0080
Rings
For cameras with backfocus from 23 to 27 mm
Set of acquisition camera adapters: backfocus 34 mm
SE0082
Rings
For cameras with backfocus from 32 to 36 mm
2-inch adapter
BA0001
Rings
2″ nosepiece for Lhires III. Allows the Lhires III to be mounted on a telescope with a 2″ (50.8 mm) eyepiece holder.
Spare Ar-Ne lamp
SE0148
Spare lamps
Spare calibration lamp (Argon & Neon). Requires the calibration module.

All about the Lhires III spectroscope:

Description

An instrument of reference

The Lhires III spectroscope is Shelyak Instruments’ “historic” instrument. Designed from the CNRS Astrophysics School in 2003 for the observation of Be stars, it has since found a wide range of applications.

Resolution & spectral range

With a resolving power of R=18,000, it provides access to Doppler velocity measurements, as well as incredible detail in the profile of a line.
The network module supplied as standard has 2400 lines/mm, giving full resolution. It can be replaced by an optional module, to access other resolutions – making the Lhires III a versatile instrument. You can adapt your resolution to your project. Weaker objects are then accessible: Novae, bright comets…

The spectral range covered is limited (of the order of ten nanometers, due to the need for high resolution), but you can select any wavelength in the visible range (400-750nm), thanks to a micrometer.

Numerous educational projects based on the Doppler effect are now possible, such as the rotation of Jupiter or Saturn.

Example of a spectrum of Jupiter,

showing the planet’s rotation

(inclination of the solar lines).

Aperture

The F/10 aperture makes it particularly well suited to Schmidt-Cassegrain telescopes. But it can also be mounted on other, more open instruments (by adding a Barlow lens).

Guiding system

Thanks to its mirror slit, the Lhires III enables the target star to be precisely positioned and held in the slit. A guiding camera (not supplied) enables the telescope’s movements to be controlled (autoguiding), ensuring optimum observation.

Interchangeable slit

The interchangeable slit supplied as standard (15-19-23-35µm) means that the instrument can be adapted to most observations, giving priority to resolution or brightness if required. Other slits are also available as options (wide slits, photometric slits), to further extend the possibilities.

Mechanical interfaces

The Lhires III is supplied with a standard interface for Schmidt-Cassegrain telescopes. If you wish to adapt it to a 2″ eyepiece holder, use the optional 2″ adapter.

The CCD adaptor supplied as standard is suitable for ATIK cameras. (13mm mechanical backfocus). We offer a wide choice of adapter rings in our accessories catalog.

The guiding camera is C-mount.

Going further with Lhires III

In addition to the astrophysical knowledge it can provide, the Lhires III is also a tool for collaboration between amateur and professional astronomers: studying Be-type stars, tracking variable stars, etc. Numerous scientific papers have been based on observations with a Lhires III.

The support of a large community

The Lhires III is widely used around the world, and you can find many examples of use and advice on the Spectro-L discussion list: https://groups.io/g/spectro-l or on the spectroscopy forum: ARAS.

Specifications

  • Resolution power R ~18000 (with 23 µm slit)
  • Dispersion of 0.012nm (9µm pixels, around Hα)
  • Aperture F/10
  • Littrow architecture (the same achromatic doublet serves as collimator and lens)
  • Adaptor rings for different types of detectors: CCD cameras, Digital Cameras, etc.
  • Mirror slit for precise guiding (4 positions 15/19/23/35 µm).
  • Slit length 8 mm
  • Wavelength selected per micrometre throughout the visible range (400-700 nm)
  • Included wavelength calibration lamp (argon/neon)
  • Included tungsten lamp for flats
  • Motorised calibration lamps for remote use
  • Schmidt-Cassegrain adaptor (2″) as standard, mechanical backfocus 68.5 mm,
  • Dual-lens C-mount guide port (focal ratio: 0.8x), mechanical backfocus 17.5 mm guide camera
  • T-mount acquisition port, mechanical backfocus 55 mm (APN compatible)
  • Interchangeable grating module (2400 tt/mm as standard)
  • Light: 1.7 kg
  • Compact: 250 mm x 200 mm x 83 mm
  • Supplied in a hard case, with an eyepiece holder and a set of tools.

Composition

  • The Lhires III spectroscope
  • The interchangeable slit (15-19-23-35µm)
  • Schmidt-Cassegrain telescope interface
  • CCD adapter (for camera with 13mm back focus)
  • Eyepiece holder (for observing the Sun’s spectrum by eye; eyepiece not supplied)

Documents

Applications

Articles related to the Lhires III spectroscope:

shelyak spectroscopie

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38420 Le Versoud – FRANCE
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