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(Objects in the LMC Cluster R136)

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GOAL: This tutorial shows you how to use the MAST Discovery Portal to make a Color-Magnitude Diagram, determine which objects have HST spectral data available, and get the details of the spectral observations.

SCIENCE CASE: The science case is investigating objects that have both HSC magnitudes and HST spectra (e.g. in the LMC Cluster R136). Finding charts for the objects can be found in Massey and Hunter 1998, ApJ, 493, 180).

NOTE: For more information on spectroscopic matching (e.g. which spectroscopic observations were matched, how was the matching performed), see the FAQ (link).

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Step 1 - Search the HSC V2 for objects in R136

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Note that you can use the HLA Interactive Display to get a better view of the field (e.g. by changing the contrast level), which will allow you to better identify specific sources. After clicking on the Load Detailed Results icon, click on the Preview image.

Step 2 - Make a Color-Magnitude Diagram (CMD) of the Cluster.

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Next, select X = V-R and Y = A_F555W (orange). Click on the Update Series button (yellow) to plot the CMD. Reverse the Y axis to have magnitudes go from bright to faint (purple).

Step 3 - Mark objects with spectra in the AstroView

In the Filters area, look under the Spectrum Flag to see that there are 62 objects with spectra (blue). Click on "Y" to filter on those objects (green). Zoom out in Astroview to see all the objects. Note that the icon in the Actions area (orange) indicate spectral data is available (which we will examine in Step 5).

Step 4 - Show the objects with spectra in the Color-Magnitude Diagram

Click on the Edit Columns box to select all these objects in the List of Objects (purple in the previous figure). Deselect the Spectrum Flag in the Filters area (so that all objects will appear in the CMD) and hit Update Series and reset the plotting range. The objects with spectra are now highlighted.

Step 5 - Examine individual objects

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Go back to the search results page and see that the object is now at the bottom of the list. Use the bullseye (blue) to center the object in Astroview ((green).

To examime examine the spectrum of the object, click on the icon (orange in Step 3).

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