Baader Planetarium MPE DADOS User Manual
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Baader Planetarium MPE DADOS User Manual

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  • Page 2 The collaborators on the DADOS spectrograph project are: Max-Planck Institut für Extraterrestrische Physik • www.mpe.mpg.de CAOS • www.eso.org/projects/caos/ Baader Planetarium GmbH • Zur Sternwarte D - 82291 Mammendorf Tel.: +49 (0) 8145 - 80 89-0 Fax: +49 (0) 8145 - 80 89-105 www.baader-planetarium.de...
  • Page 3 DADOS Spectrograph User’s Guide Thank you for purchasing this Baader Planetarium product. To get the most out of your DADOS Spectrograph, please read this instruction manual thoroughly before starting to work with the spectrograph. Keep this User’s Guide available for future reference and visit the Baader Planetarium website: http://www.baader-planetarium.de...
  • Page 4 Unpacking As you unpack the spectrograph, check the list below and make sure that all items shown above are included. If anything is missing contact your original retailer. Standard accessories: • DADOS spectrograph • Allen Wrench 1.5 mm • Eyepiece 20mm •...
  • Page 5 Part description 1. 2” Nosepiece 2. Slit illuminator 3. 1 ¼” Slit viewer port 4. Slit-viewer port locking screws 5. Micrometer 6. Rotation stage counter spring (pre-adjusted, do not touch) 7. Focuser 8. Focuser locking screw 9. Grating angle locking screw For a full list of accessories see Appendix D...

  • Page 6: Table Of Contents

    Table of Contents 1. INTRODUCTION 2. QUICK SETUP 2.1 Attaching an eyepiece to the focuser 2.2 Focusing the spectrum 2.3 Changing the spectral range 2.4 Observing some common light sources 3. CONFIGURING DADOS FOR ASTRONOMICAL OBSERVATION 3.1 Coupling a detector to DADOS 3.1.1 Astronomical CCD camera 3.1.2 SLR or D-SLR body 3.2 Fine focusing of the camera objective...
  • Page 7 APPENDIX B: CARE OF THE OPTICAL COMPONENTS APPENDIX C: SPECIFICATIONS APPENDIX D: OPTIONAL ACCESSORIES APPENDIX E: BIBLIOGRAPHY...

  • Page 8: Introduction

    1. Introduction The DADOS spectrograph is an instrument that displays the spectra from different light sources. The name DADOS means “dice” in Spanish. It was designed to be used as either a spectroscope or as spectrograph, mainly for astronomical and instructional purposes.
  • Page 9 Never aim DADOS straight to the Sun! Irreversible eye damage will occur!

  • Page 10: Quick Setup

    2. Quick setup 2.1 Attaching an eyepiece to the focuser Remove the T2 dust cap by rotating it counterclockwise. Mount the Baader T2 quick changing system (#2456313 + #2456320). Lock the Baader T2 quick changing system and mount the focusing Baader eyepiece holder (#2458125).

  • Page 11: Focusing The Spectrum

    Insert the DADOS 20mm eyepiece (or the DADOS 10mm eyepiece for higher magnification) into the focusing eyepiece holder. Lock the eyepiece with any of the three locking screws. 2.2 Focusing the spectrum Point the 2” nosepiece (#1 on the page 5 diagram) to a fluorescent light source or a neon lamp.
  • Page 12 Lock the focus with the locking screw once sharp focus is achieved. Rotate the focusing eyepiece holder for fine focus adjustments.

  • Page 13: Changing The Spectral Range

    2.3 Changing the spectral range Slightly loosen the grating angle locking screw (#9). Center the spectral lines of your choice by adjusting the micrometer. Tighten the grating angle locking screw (#9) to secure the selected setting.

  • Page 14: Observing Some Common Light Sources

    2.4 Observing some common light sources DADOS lets you observe and analyze a large variety of light sources. Specifically, you can quickly set up the instrument to observe: Neon lamps • (some pilot lights in washing machines, multi-outlet power strips, etc.) Fluorescent lamps •...
  • Page 15 Examples of spectra taken with DADOS and a 200 lines/mm grating: HeAr calibration lamp Neon Continuous 1 and 2 order Solar spectrum Note: Spectra obtained with Canon 10D EOS Camera at different grating angles. The calibration Lamp is only visible in the dark. Shield it from daylight or connect it to DADOS.
  • Page 16 Examples of spectra taken with DADOS and a 900 lines/mm grating: HeAr calibration lamp Neon Fluorescent Continuous Solar spectrum Note: Spectra obtained with Canon 10D EOS Camera at different grating angles. The Calibration Lamp is only visible in the dark. Shield it from daylight or connect it to DADOS.

  • Page 18: Configuring Dados For Astronomical Observation

    3. Configuring DADOS for astronomical observation The spectrograph should be set up correctly to ensure proper function.

  • Page 19: Coupling A Detector To Dados

    3.1 Coupling a detector to DADOS 3.1.1 Astronomical CCD camera The DADOS optical design is optimized to cover the field of CCD-chips with a dimension of 13,8x9,2mm and a pixel size of 9µm. Detectors having larger chip size than 13.8 x 9.2 mm may be used;...
  • Page 20 Mount the T2 change ring onto the SBIG detector. Mount the quick changer onto the T2 male thread of the DADOS collimator focuser (#7). Join the detector and the change ring combo. Rotate the camera into the desired orientation.
  • Page 21 Clamp the camera by tightening the locking screw of the T2 quick changer. DADOS with imaging detector mounted.

  • Page 22: Slr Or D-Slr Body

    3.1.2 SLR or D-SLR body Obtain the appropriate T-Adapter for your type of camera. Prepare the DSLR camera body to be attached to the spectrograph. Screw the DSLR T-Ring onto the spectrograph focusing unit. Attach the camera to the T- Ring adapter.
  • Page 23 Open the three set screws of the Camera T-Ring. Rotate the camera body into the desired position. Lock the three set screws of the camera T-Ring. DADOS with mounted DSLR camera.

  • Page 24: Fine Focusing Of The Camera Objective

    3.2 Fine focusing of the camera objective Whether you have an astronomical CCD camera or a SLR body, follow the instructions below to achieve the best possible focus of the instrument. Loosen the focuser locking screw (#8) to focus the detector.

  • Page 25: Selecting Wavelength Range

    3.3 Selecting wavelength range Slightly loosen the grating angle locking screw (#9). Center on certain spectral lines by rotating the micrometer (#5). Prepare spectral charts of labora- tory lamps Tighten the grating angle locking screw to secure the selected setting. If you want to download the spectral charts ∗...

  • Page 26: Using The Slit-Viewer

    3.4 Using the slit-viewer 3.4.1 Attaching an eyepiece to the slit-viewer Mount the slit-viewer onto the 20mm DADOS guiding eyepiece. Slit-viewer attached to eyepiece. Slide the 1 ¼” stop ring onto the eyepiece’s chrome sleeve and lock it. Insert the eyepiece assembly into the 1 ¼”...
  • Page 27 Focus the slit by manually pushing or pulling the eyepiece. After having focused the image of the three slits, lock the eyepiece by using the locking screw (#4) of the 1 ¼” slit viewing port (#3). Open the set screws of the stop ring and move it ring down to sit flush on top of the eyepiece holder.

  • Page 28: Attaching A Webcam To The Slit-Viewer

    3.4.2 Attaching a webcam to the slit-viewer Remove the 18mm long 1 ¼” extension tube of the slit-viewer assy. Mount the remaining body of the slit-viewer onto the 1 ¼” nosepiece of the webcam. Example: Celestron NexImage 5 with the 1 ¼” nosepiece Slide the 1 ¼”...
  • Page 29 Attach the webcam combo to the 1 ¼” slit viewing port (#3). Focus the Webcam by manually pushing or pulling it. Rotate the Webcam body until it is approximately aligned with the major axis of DADOS. After having focused the image of the three slits, lock the webcam combo by using the locking screws (#4) of...
  • Page 30 Tighten the Stop Ring to secure the proper focus position. Realign the orientation of the slit by rotating the Webcam. DADOS with Webcam mounted on to the slit viewer port.

  • Page 31: Zooming The Slit View In And Out

    3.4.3 Zooming the slit view in and out The lens inside the slit viewer can be adjusted in order to magnify the image size of the 3 slits on the detector of the Webcam. Remove the second 1 ¼” extension tube from the slit viewer body.
  • Page 32 Minimum magnification as seen by the CCD chip. Slide the lens holder tube away from the Webcam in order to magnify the image. Maximum magnification as seen by the CCD chip. Lock the new position of the lens holder tube by tightening the headless set screw.

  • Page 33: Coupling The Spectrograph To The Telescope

    3.5 Coupling the spectrograph to the telescope Use the provided 2” nosepiece to attach DADOS to your telescope. Alternatively use the female T-2 thread (M42 x 0.75), by removing the 2” nosepiece. Or remove the female T-2 thread adapter to get access to a female 2”...

  • Page 34: Operating The Spectrograph At The Telescope

    3.6 Operating the spectrograph at the telescope Before attaching DADOS to the telescope, make sure you have already focused the spectrum on the camera’s focal plane, with the proper orientation. Attach DADOS onto the Telescope with a 2” interface if using the 2”...
  • Page 35 Use the telescope’s focusing mechanism to focus the star in the middle of the slit by observing its image through an eyepiece or webcam. Use the slit illuminator (#2) to illuminate the slits and slowly slew the telescope to bring the star inside one of the slits.

  • Page 36: Appendix A: Maintenance

    Appendix A: Maintenance A.1 Battery replacement Simply turn the back of the Illuminator counterclockwise approximately three turns to open the battery compartment. Replace dead batteries with two round “hearing aid” batteries 1.5V (such as Camilion AG 3 SR 41 #2454306). Then turn the back of the illuminator clockwise till it is completely closed.

  • Page 37: Grating Replacement

    A.2 Grating replacement Attention Touching the grating will destroy it beyond repair! Do not attempt to remove dust by breathing or blowing air onto the grating! Small droplets of moisture and saliva can permanently damage the grating as well. Do not use compressed or canned air! This will likewise transport moisture, grease or propellant onto the grating.
  • Page 38 Have the 900 lines/mm grating with holder readily available. Loosen the grating angle locking screw (#9) by one turn only. Rotate the micrometer backwards to show an 8mm setting on the Vernier scale. Use the 1.5mm Allen wrench to remove the four hex-head screws.
  • Page 39 Take off the side plate/grating holder assembly. Be careful not to touch the grating. Release the headless set screw inside of the pressure plate by 2 full turns counterclockwise using the 1.5mm Allen wrench. Remove the grating holder from the pressure plate. Take the 900 lines/mm grating holder out of the storage container and store...
  • Page 40 Place the 900 lines/mm grating holder into the pressure plate. Rotate the grating holder to adjust the proper position in regard to the markings in the pressure plate. Each mark indicates the position of a specific grating. Be sure to use the proper one to achieve the optimal throughput.
  • Page 41 Example of position: 900 lines/mm grating. Lock the pressure plate by tightening the headless set screw clockwise. Carefully replace the side plate/grating holder assembly. Replace and tighten the 4 screws that secure the side plate.
  • Page 42 Adjust the micrometer to a Vernier position of approximately 2.5. Lock the grating tilt mechanism by rotating the grating angle locking screw clockwise. DADOS with grating exchanged.
  • Page 43 Dust can only be cleaned from the grating and slit by Baader- Planetarium. Do not clean gratings or slit yourself as this may void the warranty. Lenses cannot be cleaned with common cleaning agents. Use only Baader Planetarium Optical Wonder fluid (#2905007) to clean the lenses.
  • Page 44 Appendix C: Specifications Mechanical Weight (without cameras and 0.85 kg eyepieces) Dimensions (see Figure in Part 80 × 150 × 205 Description) Electrical Red LED Battery SR 41 or equivalent Environmental Operating temperature -10 to +30 Storage temperature -30 to +35 Humidity (relative) 0 to 80 % Storage humidity...
  • Page 45 Performances Resolving power λ / ∆ λ on camera objective axis and 25 µm slit Grating of 200 lines/mm Theoretical Measured λ (nm) @ 416 @ 616 @ 697 Grating of 900 lines/mm Theoretical Measured λ (nm) 2038 2000 @ 371 3910 3000 @ 561...
  • Page 46 T2 adapters for many SLR camera models. Examples: Nikon Ref. 240 8300 Canon EF Ref. 240 8319 See the Baader Planetarium Web site for a complete list. Reflection grating 25 x 25 x 9mm, 900 lines/mm mounted in quick exchanger. Ref. 2458556...
  • Page 47 Dados rings for mounting on tripods or optical bench Ref. 2458593 SpecTrack Autoguiding- Software for star spectroscopy Ref. 2458650...
  • Page 48 Appendix E: Bibliography Stars and Their Spectra: An Introduction to Spectral Sequence Author: James B. Kaler 1989 Pages: ISBN: 0521304946 The Spectra and Structures of Simple Free Radicals: an introduction to Molecular Spectroscopy Author: Gerhard Herzberg 1989 Pages: ISBN: 0840486495396 Getting the Measure of the Stars Author: W.A.
  • Page 49 Handbook of CCD Astronomy Author: Steve Bruce Howell 2006 Pages: ISBN: 0521852153 Astronomical Spectroscopy: an Introduction to the Atomic and Molecular Physics of Astronomical Spectra Author: Jonathan Tennyson 2005 Pages: ISBN: 1860945295 Spectroscopy: the Key to the Stars: Reading the Lines in Stellar Spectra Author: Keith Robinson 2007...
  • Page 50 Foundations of Astronomy. Author: Michael A. Seeds 2000 Pages: ISBN: 0534378552 The Observation and Analysis of Stellar Photospheres Author: David F. Gray 2005 Pages: ISBN: 0521851866 Observing Variable Stars Author: Gerry A. Good 2003 Pages: ISBN: 1852334983...
  • Page 51 Physics of Star Formation in Galaxies Author: Francesco Palla 2002 Pages: ISBN: 3540431020 The Analysis of Starlight. One Hundred and Fifty Years of Astronomical Spectroscopy Author: John B. Hearnshaw 2014 Pages: ISBN: 978-1107031746 An Introduction to the Theory of Stellar Structure and Evolution Author: Dina Prialnik 2000...
  • Page 52 Optical Astronomical Spectroscopy Author: Christopher R. Kitchin 1995 Pages: ISBN: 0750303468 Atomic Spectra and Atomic Structure Author: Gerhard Herzberg 2007 Pages: ISBN: 140675322X Observers Guide to Stellar Evolution Author: Mike Inglis 2007 Pages: ISBN: 1852334657...
  • Page 53 Spectrograph Design Fundamentals Author: John James 2007 Pages: ISBN: 10-0521864631 Practical Amateur Spectroscopy Author: Stephen F. Tonkin et al. 2002 Pages: ISBN: 1852334894 Journey from the Center of the Sun Author: Jack B. Zirker 2002 Pages: ISBN: 0691057818...
  • Page 54 The Behavior of Chemical Elements in Stars Author: Carlos Jaschek 1995 Pages: ISBN: 052141136X The Classification of Stars Author: Carlos Jaschek 1990 Pages: ISBN: 0521267730 Introduction to Stellar Astrophysics. Vol.3: Stellar Structure and Evolution Author: Erika Boehm-Vitense 1992 Pages: ISBN: 0521348714...
  • Page 55 Introduction to Astronomical Spectroscopy Author: Immo Appenzeller 2013 Pages: ISBN: 978-1107601796 An Introduction to Modern Astrophysics Author: Bradley W. Carroll, Dale A. Ostlie 2013 Pages: 1478 ISBN: 978-1292022932 Stellar Evolution Physics: Physical Processes in Stellar Interiors Author: Icko Iben, jr. 2012 Pages: ISBN:...
  • Page 56 Stellar Evolution Physics: Advanced Evolution of Single Stars Author: Icko Iben, jr. 2012 Pages: ISBN: 978-1107016576 Astronomy: Methods Author: Hale Bradt 2003 Pages: ISBN: 978-0521535519 Astrophysics: Processes Author: Hale Bradt 2008 Pages: ISBN: 978-0521846561...
  • Page 57 Stellar Spectral Classification Author: Richard O. Gray, Christopher J. Corbally 2009 Pages: ISBN: 978-0691125114...
  • Page 58 WAVELENGTH SETTINGS Camera Grating:___________ Model:____________________ Micrometer position Central Wavelength Camera Grating:___________ Model:____________________ Micrometer position Central Wavelength Camera Grating:___________ Model:____________________ Micrometer position Central Wavelength...
  • Page 59 WAVELENGTH SETTINGS Camera Grating:___________ Model:____________________ Micrometer position Central Wavelength Camera Grating:___________ Model:____________________ Micrometer position Central Wavelength Camera Grating:___________ Model:____________________ Micrometer position Central Wavelength...
  • Page 60 Except for brief quotation in critical articles or reviews, no reproduction of this manual, in any form, in whole or in part, may be made without written authorization of Baader Planetarium GmbH. Baader Planetarium GmbH Zur Sternwarte D - 82291 Mammendorf Tel.: +49 (0) 8145 - 80 89-0...

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