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Variable stars from two surveys of microlensing in M31

Published online by Cambridge University Press:  12 April 2016

Arlin P.S. Crotts ,
Richard P. Boyle ,
Christopher J. Corbally  and
the MEGA Collaboration
Arlin P.S. Crotts
Affiliation:
Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA
Richard P. Boyle
Affiliation:
Vatican Observatory Research Group, University of Arizona, Tucson, AZ 85721, USA
Christopher J. Corbally
Affiliation:
Vatican Observatory Research Group, University of Arizona, Tucson, AZ 85721, USA

Abstract

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Recently we completed the VATT/Columbia survey monitoring a portion of M31 for microlensing and stellar variability, and report here on the microlensing result. Also, we have nearly completed a much larger survey (MEGA) covering most of the stars in M31, for which we have started cataloging many tens of thousands of Cepheids, Miras, eclipsing variables and other kinds of variable stars. The microlensing results from these two surveys hint that a significant fraction of the dark matter in M31 is composed of stellar-mass objects in the halo.

Type
Part 2. What variable stars tell us about the Local Group, including the distance scale
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 83 - 86
Copyright
Copyright © Astronomical Society of the Pacific 2004

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