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APM Professional Telescopes

APM Professional Telescopes

1m F/8 Ritchey Chrétien with dual Nasmyth Foci, Cape Town (South Africa)

Another large telescope for the South African Astronomical Observatory (SAAO). An 1m F/8 Alt-Az mounted Ritchey Chrétien for robotic use. It has dual Nasmyth Foci. The main telescopes used for research are located at the SAAO observing station (32°22.795’S 20°48,657’E) near Sutherland in the Northern Cape, a 4-hour drive from Cape Town.

Astronomy is our job

Observatory Telescopes

Big prime focus telescopes for private or public observatories including installation and full service.

Robotic / Remote

Robotic instruments for automatic imaging or telescopes for remote observation.

eShel II Spectroscope

eShel II Spectroscope

Spectro eShel T202x210 62 w2

A fiber-fed spectroscope

The eShel spectroscope can work over a wide spectral range (390 to 700nm) at high resolution (R = 10,000). This is made possible by the use of multiple orders (in this case from 32 to 53); an Echelle spectrum reads “like a book”: the end of one order is found at the beginning of the next. We opted for a fiber-optic solution to increase the accuracy of radial velocity measurements (the instrument is separated from the telescope, if possible in a temperature-controlled room) and for greater user comfort.We have developed this instrument based on our experience with the Musicos and Narval professional spectroscopes.

Echelle spectroscopy

This technique achieves high spectral resolution by using the >30 diffraction orders of a grating. The resulting spectrum passes through a cross disperser, which “slices” the spectrum into successive orders, occupying the entire surface of the camera’s sensor. In this way, the entire spectral range in the visible spectrum is obtained over some twenty orders (in the case of the eShel).Schema EchelleSchematic diagram of an Echelle spectrograph (© Christian Buil)

The eShel spectroscope

EshelDetour 231x300dsco 1The main module generates the Echelle spectrum. It covers the spectral range from approx. 390 to 700 nm with >10000 resolution (with an ATIK 460 Ex camera in 2×2 binning not included). It has an FC/PC connector for attaching 50 µm object fiber.Spectrum of delta Sco (Be star). Note the H-alpha line in emission (click on image to enlarge). Canon 40D, 9 x 300 s, telescope 0,2m (C.Buil)The eShel spectroscope must be accompanied by the FIGU – Fiber Injection and Guiding Unit – (PF0008, for example), the calibration module (PF0012) and the two optical fibers: one for the target and the other for calibration. All these elements are included in the ES0006 “eShel complete system”.

 

Demetra software for eShel

Easy to use and free of charge, it runs under MS Windows, and accompanies you from spectra acquisition to data reduction. It enables remote control of the various modules (FIGU and calibration module).

Examples of raw spectra

 betlyr 50pc 1betlyr 50pc  pcyg 50pc 1pcyg 50pc WR140 6 64293 1080x675 WR140-6


WR 140 and Nova Del 2013 1x600s SCT 0,35 m and ATIK 460EX bin 2×2 (Click to enlarge)

Example of time series of a pulsating star

BWVul anim20080726crop 1

Here’s a good example of evolution of a pulsating star (BW Vul, raw images, 5min exposures, 60cm f/3.5 telescope at Pic du Midi; ccd camera QSI516).

 

 

 

BW Vul p17 1

The BW Vul spectrogram over about 5h around the Sodium doublet:

 

 

 

 

Specifications

  • Resolution Power R = 10 000
  • Spectral range covered: 390 to 750nm
  • F/5 collimator
  • FC connector for 50µm object fiber
  • 85mm lens, max. 40mm mechanical backfocus

Composition

  • eShel II spectroscope
  • The base, for perfect stability
  • The 85mm F/1.8 lens

Documents

Applications

  • High-resolution spectrum of variable stars
  • Time series of the pulsating star (RR Lyr)
  • Radial velocities calculation
  • High-resolution solar spectrum
  • Be stars survey
  • Planetary nebulae
  • Spectral classification of stars
  • Classification of asteroids
  • Lunar geology
  • Planets composition
  • Abundance measurement
  • Novae
  • RR Lyrae
  • Herbig Ae/Be
  • T Tauri
  • Wolf Rayet

External links

Software

DEMETRA software for spectrum acquisition and processing

 

APM Professional Telescopes

1m F/8 Ritchey Chrétien with dual Nasmyth Foci, Cape Town (South Africa)

Another large telescope for the South African Astronomical Observatory (SAAO). An 1m F/8 Alt-Az mounted Ritchey Chrétien for robotic use. It has dual Nasmyth Foci. The main telescopes used for research are located at the SAAO observing station (32°22.795’S 20°48,657’E) near Sutherland in the Northern Cape, a 4-hour drive from Cape Town.

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