Workshop Tutorial - Planning CHARA Observations

 

  1. Pick a target - estimate the angular diameter (or binary separation, disk size, etc). 

    JMMC Stellar Diameters Catalogue available through VizieR.

    Color relations, look up tables etc.



  2. Run JMMC planning software.  The software can be run online using the JMMC servers or you can sign up for a JMMC account and download the java jar file directly (see Installation Help).  Today we will use the online version.

  3. Select calibrators using SearchCal.

    Click on the "Download Application" link.

    Open with IcedTea Web Start.

    Click Proceed... Allow... Create Desktop Shortcut...

    ---- Wait until SearchCal GUI opens. ----

  4. Enter Target into SearchCal.

    Select wavelength filter band and maximum baseline.

    Select magnitude search range.

    Click on the "Get Calibrators" button.

    After search results appear, take off flags for:
    "Reject Spectral Types (and unknowns)"
    "Reject Luminosity Classes (and unknowns)"

    Click on the HD number of possible calibrators to bring up the SIMBAD page and review references.

  5. Start the planning software ASPRO2.

    Click on the "Download Application" link.

    Open with IcedTea Web Start

    Click Proceed... Allow... Create Desktop Shortcut...

    ---- Wait for ASPRO2 GUI to open. ----

  6. Enter target and calibrators into "Targets" box in ASPRO2.

    Select calibrator and click the "Editor" button.

    Click the "Flag Calibrator" button.

    To associate a calibrator with a particular science target, click on the calibrator, drag and drop onto target name.

  7. Select Interferometer: CHARA

    Select Instrument: CLASSIC, CLIMB, MIRC, JOUFLU, PAVO, VEGA.

    Select Baseline Configuration (e.g., S2-E2-W2)

    The POPs set the fixed delay and determine when the target can be observed on sky.  Selecting "Auto" will select the optimal POPs.  Changing the POPs will change the timing of the delay window.

  8. The "Map" tab gives a layout and the baseline lengths for a selected configuration.

  9. Click on the "Observability" tab to see when the targets are available on sky.  Change the POPs (by selecting options from pull down menu or setting by hand) to see how the POPs affect the timing.

  10. Click on the tab for "UV Coverage."  This gives the UV coverage of the telescope baselines projected on to the plane of the sky.

  11. Add a target model by clicking on the target name in the "Targets" box.

    Click on the "Editor" button.

    Click on the "Models" tab.

    Select the model type (disk, point source, ring, etc).  Then click the "Add" button.

    Enter the diameter value into the model parameter box.

    Hit "OK".

    Now the "UV Coverage" will show the two-dimensional Fourier Transform of the model overplotted with the UV sampling.  Change the telescopes to see how the UV coverage changes.

  12. The "OIFITS Viewer" tab plots the simulated squared visibility data (Vis2data) and closure phases (T3Phi) for the selected model, instrument, and telescope configuration.

    At the bottom of the page, select color by "baseline or triplet".

    Change the "Instrument" to MIRC_6T to see all possibilities of available baselines.  Look at both the UV Coverage and OIFITS Viewer.

  13. Use the Target "Editor" button to add a second model component (e.g. point source binary companion at 5 mas separation, ring, elongated disk, etc). 

    See the effects on the Fourier Transform (UV Coverage tab) and the "OIFITS" tab.

CHARA Community Workshop - Toledo

University of Toledo

McMaster Hall - Room MH 4009

 

Schedule for Friday, September 8, 2017

Download pdf version of the schedule.

Topic Speaker Length Time
       Registration
  15 10:45 AM
Welcome and Overview of the CHARA Array Douglas Gies 30 11:00 AM
Principles of Interferometry and Science Review Gail Schaefer 40 11:30 AM
Applying for Time at the CHARA Array Douglas Gies 30 12:10 PM
Applying for Time at the Very Large Telescope Interfereometer Jean Baptiste Le Bouquin 20 12:40 PM
        Lunch   60 1:00 PM
Observing Strategies and Planning Software Gail Schaefer 20 2:00 PM
Data Format and Modeling/Imaging Software Gail Schaefer 20 2:20 PM
Science Topic: Summary of Imaging Result with MIRC John Monnier 20 2:40 PM
Science Topic: Massive Stars Noel Richardson 20 3:00 PM
Science Topic: Investigating Disk Physics with Interferometry Aaron Sigut 20 3:20 PM
Open discussion to talk about ideas for CHARA observing All 20 3:40 PM
      End of Workshop     4:00 PM
Tour of Ritter Observatory Noel Richardson   4:00 PM

 

CHARA Community Workshop - Caltech/IPAC

 

Caltech/IPAC

Morrisroe Astroscience Laboratory - Room 102

 

Schedule for Sunday, October 8, 2017

Download pdf version of the schedule.

Topic Speaker Length Time
       Registration
  10 11:00 AM
Welcome and Overview of the CHARA Array Douglas Gies 30 11:10 AM
Principles of Interferometry and Science Review Gail Schaefer 40 11:40 AM
Applying for Time at the CHARA Array Douglas Gies 30 12:20 PM
        Lunch   60 12:50 PM
Observing Strategies and Planning Software Gail Schaefer 20 1:50 PM
Data Format and Modeling/Imaging Software Jeremy Jones 30 2:10 PM
Science Topic: Stellar Diameters and Life at CHARA Kaspar von Braun 20 2:40 PM
Science Topic: Science Highlights with the PAVO Beam Combiner Daniel Huber 20 3:00 PM
Science Topic: Ages of Stars Jeremy Jones 20 3:20 PM
Open discussion to talk about ideas for CHARA observing All 20 3:40 PM
      End of Workshop     4:00 PM

 

CHARA Community Workshop - AAS

 

231st AAS Meeting in Washington, DC

Gaylord National Convention Center - Potomac Ballroom 6

 

Schedule for Sunday, January 7, 2017

Download pdf version of the schedule.

Topic Speaker Length Time
Welcome Douglas Gies 10 10:00 AM
Overview of the CHARA Array Theo ten Brummelaar 30 10:10 AM
Principles of Interferometry and Science Review Gail Schaefer 40 10:40 AM
Applying for Time at the CHARA Array Douglas Gies 30 11:20 PM
        Group Photo, Lunch, and Discussion
  90 11:50 PM
Observing Strategies and Planning Software Gail Schaefer 30 1:20 PM
The CHARA Archive and Working with OIFITS Data Jeremy Jones 30 1:50 PM
Recent Developments at NPOI and MROI Gerard van Belle 30 2:20 PM
Open discussion to talk about ideas for observing programs All 10 2:50 PM
      End of Workshop     3:00 PM