The Dense Core of M30

Computer Science

Scientific paper

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Hst Proposal Id #7379 Binary Stars

Scientific paper

Using a sequence of dithered WFPC2 images {F336W, F555W and F814W} we propose to make a detailed study of binaries, and the general stellar population in the core of M30, a dense post core collapse globular cluster. We will make a sensitive search for stellar variability from main sequence binaries, cataclysmic variables, and blue stragglers and construct a precise CMD from the dithered images using a newly proven technique which fully exploits the resolution and photometric accuracy of {it HST}. Using this CMD we will examine evidence for a binary sequence above the main sequence, and study mass segregation and the luminosity function of M30, by comparing with isochrones from the Yale Stellar Evolution Code. M30 is a superb target for these {it HST} studies because of its unusually high color gradient and blue straggler frequency {signifying intense dynamical effects}, its extremely low metallicity, small central relaxation time and currently unexplained luminosity function. These studies will be combined with our ground-based observations of M30 to help formulate a coherent understanding of this remarkable cluster, teaching us more about the dynamics of dense evolved clusters and the nature of the exotic objects once hidden in their cores.

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