thumbs prev next Thumbnails Previous Next

Variable Stars in M13



From the author of   Sizing Up The Universe

M13-LRGB
Click on image for full uncropped version


M13-HRdiag
Variable stars are shown as pairs of points connected by a line-segment


Stars above the red line are presumed to be variable stars.
Variable stars between magnitude 13 and 14 are the RR-Lyrae stars.
M13-variable-thresholds

Here are the two image files (in "fits" format):
m13_2009-LRGB.fit
m13_2014-LRGB.fit

Here is the Matlab function used to make the HR-diagram:
makeHRdiagRRlyrae.m

Click here for webpage showing individual images of M13

Return to Thumbnails