May 31, 2012

Leo II stellar population selection

Bootes I was not clear in the spatial plot data after doing color-magnitude population selection, so the process is repeated here on Leo II with much better results.

Color-magnitude diagram, isochrone shifted according to NED listing for average published distance modulus for Leo II:



First all of the SDSS data is plotted spatially. The ring-like overdensity in this image is Leo II, though the hope is that the CMD population selection will clean up the data and make it even clearer.


Below is the spatial plot for the population selected initially (shown in red on first plot, distance less than or equal to 0.2 from isochrone).


The plot as a whole is much less dense, and Leo II is still easily seen. Doing a new selection (on points distance to isochrone less than or equal to 0.4) makes the picture a little clearer:

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