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Session 52 - Source Surveys and CMB Radiation.
Display session, Wednesday, June 10
Atlas Ballroom,

[52.01] Results from the Columbia/VATT Microlensing Survey of M31

R. Uglesich, A. P. S. Crotts (Columbia U.), A. B. Tomaney (U. Washington), G. Gyuk (SISSA)

We present the results of a search for microlensing activity in the outer bulge and inner disk of M31 due to masses in M31 and the Galaxy. We have obtained data for the 1994-1997 observing seasons with the 1.8m Vatican Advanced Technology Telescope, KPNO 4m, MDM 1.3m McGraw-Hill Telescope and 2.5m Isaac Newton Telescope. Variability is detected and monitored using the technique of "difference image photometry." From the 1995 data, we have 4 events consistent with microlensing due to masses of about 1 M_ødot and additonal baseline coverage from data obtained in 1996 and 1997 confirm that these events are inconsistent with being long-period variable stars. In addition, we present candidate microlensing events discovered in the 1996 and 1997 seasons and discuss the potential for an expanded survey using newly available wide-field CCD imagers which could yield dozens of events per season.

Program listing for Wednesday