Microlensing: A Tool to Probe Distant Binary Populations
作者： Rosanne Di Stefano
DOI: 10.1017/S0074180900225643
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摘要: Programs designed to observe gravitational microlensing are poised provide a great deal of information about binary populations far from Earth, including those in the Galactic Bulge, Magellanic Clouds, M31, and perhaps other external galaxies. Because many millions stars monitored, observations allow us study binaries three ways: (1) when they “involved” event (as either lens or lensed source), (2) variability due binarity produces significant variations light curve, (3) more distant star is attenuated refracted by matter associated with system (e.g., disk). Microlensing will discover large numbers planetary systems variety galactic environments. Thus, comparative statistical studies properties (distributions mass ratios orbital separations) possible. An intriguing sign that we have already begun learn through comes work indicating all lenses detected date may fact be binaries. For along direction Clouds this would imply that, if primarily located Halo, then MACHOs tend If, on hand, most giving unique way explore stellar population
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