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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 308866.0, MPI für Astronomie / Publikationen_mpia
Removing the microlensing blending-parallax degeneracy using source variability
Authors:Assef, R. J.; Gould, A.; Afonso, C.; Albert, J. N.; Andersen, J.; Ansari, R.; Aubourg, É.; Bareyre, P.; Beaulieu, J. P.; Charlot, X.; Coutures, C.; Ferlet, R.; Fouqué, P.; Glicenstein, J. F.; Goldman, B.; Graff, D.; Gros, M.; Haissinski, J.; Hamadache, C.; de Kat, J.; Le Guillou, L.; Lesquoy, É.; Loup, C.; Magneville, C.; Marquette, J. B.; Maurice, É.; Maury, A.; Milsztajn, A.; Moniez, M.; Palanque-Delabrouille, N.; Perdereau, O.; Rahal, Y. R.; Rich, J.; Spiro, M.; Tisserand, P.; Vidal-Madjar, A.; Vigroux, L.; Zylberajch, S.; Bennett, D. P.; Becker, A. C.; Griest, K.; Vandehei, T.; Welch, D. L.; Udalski, A.; Szymanski, M. K.; Kubiak, M.; Pietrzynski, G.; Soszynski, I.; Szewczyk, O.; Wyrzykowski, L.
Date of Publication (YYYY-MM-DD):2006
Journal Abbrev.:The Astrophysical Journal
Start Page:954
End Page:964
Audience:Not Specified
Abstract / Description:Microlensing event MACHO 97-SMC-1 is one of the rare microlensing events for which the source is a variable star, simply because most variable stars are systematically eliminated from microlensing studies. Using observational data for this event, we show that the intrinsic variability of a microlensed star is a powerful tool for constraining the nature of the lens by breaking the degeneracy between the microlens parallax and the blended light. We also present a statistical test for discriminating the location of the lens based on the chi2 contours of the vector Lambda, the inverse of the projected velocity. We find that while SMC self-lensing is somewhat favored over halo lensing, neither location can be ruled out with good confidence.
Free Keywords:Cosmology: Gravitational Lensing; Stars: Variables: Other
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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