Matthew S. Povich Research
Probabilistic H-R diagram of 2,376 X-ray-emitting, disk-free stars in the Carina Nebula. The color bar gives the effective number of stars in each bin, and the bin size is shown by the cross on the plot. Dashed lines show pre-main-sequence evolutionary tracks for the labeled stellar masses and solid lines show isochrones for (right to left) 0.1, 1, 3, 10, and 30 Myr (from Siess et al. 2000).
 
Matthew S. Povich Research
Transformation of the H-R diagram onto a plot of stellar mass versus stellar age. The diagonal solid and dashed lines show the location of the zero-age main sequence (based on the models of Siess et al. 2000 and Bernasconi & Maeder 1996, respectively), and in the grayed-out region at upper right, the location of stars in the age direction is unconstrained. Stars without circumstellar disks become less probable to the lower left of the dotted lines.