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Adding a Standard Star

Adding a Standard Star

We have a library of bright G stars built availiable in the OT to speed things up here. Don't worry if you want to use a star that's not in there, we'll get back to that shortly.

Open up the CGS4_bright_G_library from the file menu of the main OT window. Simply pick a star, then drag it into your science program, taking care when you drop it that you've got a vertically downward pointing red and white arrow sign on the flat and arc observation. You might want to collapse the display of the flat and arc first, by clicking the little minus sign to the left of the "flat and an arc" label.

Once you've got a star there, you need to edit that observation to match the configuration you're actually using. There's an easy way to do this. First expand the flat and arc observation and the standard star observation so that you can see all their components. You don't need the details of the sequence at this point, so you can collapse the sequences in each to save screen space if you like. Now double click the cgs4 component in the standard star, and note the magnitude of the star. Now, single-click the CGS4 component in the flat and arc observation, and click the copy button (the one on the right of the scissors (cut) button). Now single click the CGS4 component in the standard star, and hit the paste button (the one to the right of the copy button - looks like a clipboard). When it asks if you want to replace the component, say yes. Now double click the CGS4 component in the standard star to get the editor window back, and set the magnitude back to what it was. The software will then autmatically set the exposure time and co-adds for that magnitude. you can over-ride these manually by simply changing the values. We're still working on the defaults so you might have to do this. The best thing to do is to ask your TO for the count rate after they complete the peakup, then set the time to give you around 3000 counts.

Contact: Tom Kerr. Updated: Wed Oct 6 11:54:35 HST 2004

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