changed cycle ----- Attempting Submission 6 (Fri Aug 27 17:59:44 GMT 2010) ----- We propose to image the north east quadrant of M31 to deep limits in the UV, optical, and near-IR. HST imaging should resolve the galaxy into more than 100 million stars, all with common distances and foreground extinctions. UV through NIR stellar photometry (F275W, F336W with WFC3/UVIS, F475W and F814W with ACS/WFC, and F110W and F160W with WFC3/NIR) will provide effective temperatures for a wide range of spectral types, while simultaneously mapping M31's extinction. Our central science drivers are to: understand high-mass variations in the stellar IMF as a function of SFR intensity and metallicity; capture the spatially-resolved star formation history of M31; study a vast sample of stellar clusters with a range of ages and metallicities. These are central to understanding stellar evolution and clustered star formation; constraining ISM energetics; and understanding the counterparts and environments of transient objects (novae, SNe, variable stars, x-ray sources, etc.). As its legacy, this survey adds M31 to the Milky Way and Magellanic Clouds as a fundamental calibrator of stellar evolution and star-formation processes for understanding the stellar populations of distant galaxies. Effective exposure times are 977s in F275W, 1368s in F336W, 4040s in F475W, 4042s in F814W, 699s in F110W, and 1796s in F160W, including short exposures to avoid saturation of bright sources. These depths will produce photon-limited images in the UV. Images will be crowding-limited in the optical and NIR, but will reach below the red clump at all radii. The images will reach the Nyquist sampling limit in F160W, F475W, and F814W.

This is tiling brick 19 of the M31 MCTP. The strategy is to obtain UV through IR photometry covering a large fraction of M31. Every primary target has a parallel target defined with the same coordinates, but with a different name to distinguish its location in the brick. Each visit is 2 orbits. During the two orbits, we obtain, 925, 1250, 1720, 1520, 699, and 1596 seconds of exposure in F275W, F336W, F475W, F814W, F110W, and F160W, respectively at summer orients (>180 degrees; Sched100). We obtain 1010, 1350, 1900, 1715, 799, and 1696 seconds of exposure in F275W, F336W, F475W, F814W, F110W, and F160W, respectively at winter orients (<180 degrees; Sched60) All exposure times are optimized to have the shutters of both cameras open during all buffer dumps. Thus, the exposure times are somewhat asymmetric. Orbit lengths for the orients available in winter are slightly longer than those for orients available in summe to maximize efficiency. In the first orbit, WFC3/UVIS and ACS run in parallel to obtain 2 primary exposures in F275W, 2 primary exposures in F336W, and 4 parallel exposures in F814W. There is a pointing offset to all UVIS exposures to compensate for the V2, V3 offset between the IR-FIX aperture and the UVIS-CENTER aperture; including this offset keeps the ACS parallels aligned between the two orbits. Dithers are set up to obtain Nyquist sampling in F814W and cover the UVIS chip gap in F275W and F336W. With at least 2 exposures per filter, should allow all data to be cleaned of cosmic rays except for the UVIS chip gap, which will only have single-exposure coverage. A single short exposure is performed in F814W to protect against saturation. In the second orbit, WFC/IR and ACS run in parallel to obtain 4 primary exposures in F160W, 1 primary exposure in F110W, and 5 parallel exposures in F475W. WFC/IR observations are performed during the second orbit of the visits in order to avoid any persistence issues in case the program observed before our observation uses the IR channel on a bright source. Dithers are set up to obtain Nyquist sampling in F475W and in F160W. A single short exposure is performed in F475W to protect against saturation. WFC3/IR exposures use variations of the STEP100 and STEP200 readout patterns, which protects against saturation in the IR. The F160W exposures use NSAMP=11, SAMP-SEQ=STEP100 (499s) and NSAMP=9, SAMP-SEQ=STEP200 (399s), and the F110W exposure uses NSAMP=11, SAMP-SEQ=STEP200 (799s, long orbit) and NSAMP=13, SAMP-SEQ=STEP100 (699s, short orbit) . This brick has a priority value of 18 out of 23. 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