Letter to the Editor
Images for a binary gravitational lens from a single real algebraic equation
Faculty of Science and Technology, Hirosaki University, Hirosaki 036-8561, Japan
Corresponding author: email@example.com
Accepted: 11 June 2002
It is shown that the lens equation for a binary gravitational lens being a set of two coupled real fifth-order algebraic equations (equivalent to a single complex equation of the same order) can be reduced to a single real fifth-order algebraic equation, which provides a much simpler way to study lensing by binary objects.
Key words: gravitational lensing / binaries: general / planetary systems
© ESO, 2002