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We present Spitzer Space Telescope IRAC and MIPS observations of the galacticglobular cluster M15 (NGC 7078), one of the most metal-poor clusters with a[Fe/H] = -2.4. Our Spitzer images reveal a population of dusty red giants nearthe cluster center, a previously detected planetary nebula (PN) designatedK648, and a possible detection of the intra-cluster medium (ICM) arising frommass loss episodes from the evolved stellar population. Our analysis suggests 9(+/-2) x 10^-4 solar masses of dust is present in the core of M15, and thismaterial has accumulated over a period of approximately 10^6 years, a timescaleten times shorter than the last galactic plane crossing event. We also presentSpitzer IRS follow up observations of K648, including the detection of the[NeII] 12.81 micron line, and discuss abundances derived from infrared finestructure lines.

Stellar Populations and Mass Loss in M15: ASpitzer Space TelescopeDetection of Dust in the Intracluster Medium