Skip to Main content Skip to Navigation
Preprints, Working Papers, ...

Removing the Microlensing Blending-Parallax Degeneracy Using Source Variability

Abstract : 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 to constrain 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 \chi^2 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.
Complete list of metadata

http://hal.in2p3.fr/in2p3-00080139
Contributor : Sabine Starita Connect in order to contact the contributor
Submitted on : Wednesday, June 14, 2006 - 4:43:15 PM
Last modification on : Sunday, June 26, 2022 - 11:45:55 AM

Links full text

Identifiers

Collections

IN2P3 | LAL | CNRS

Citation

R.J. Assef, A. Gould, C. Afonso, J.N. Albert, J. Andersen, et al.. Removing the Microlensing Blending-Parallax Degeneracy Using Source Variability. 2006. ⟨in2p3-00080139⟩

Share

Metrics

Record views

9