TY - JOUR
T1 - Ogle-2005-blg-153
T2 - microlensing discovery and characterization of a very low mass binary
AU - Hwang..[et al.], K. -H.
AU - Harpsøe, Kennet Bomann West
AU - Jørgensen, Uffe Gråe
PY - 2010/11/1
Y1 - 2010/11/1
N2 - The mass function and statistics of binaries provide important diagnostics of the star formation process. Despite this importance, the mass function at low masses remains poorly known due to observational difficulties caused by the faintness of the objects. Here we report the microlensing discovery and characterization of a binary lens composed of very low mass stars just above the hydrogen-burning limit. From the combined measurements of the Einstein radius and microlens parallax, we measure the masses of the binary components of 0.10±0.01 M⊙ and 0.09±0.01 M⊙. This discovery demonstrates that microlensing will provide a method to measure the mass function of all Galactic populations of very low mass binaries that is independent of the biases caused by the luminosity of the population.
AB - The mass function and statistics of binaries provide important diagnostics of the star formation process. Despite this importance, the mass function at low masses remains poorly known due to observational difficulties caused by the faintness of the objects. Here we report the microlensing discovery and characterization of a binary lens composed of very low mass stars just above the hydrogen-burning limit. From the combined measurements of the Einstein radius and microlens parallax, we measure the masses of the binary components of 0.10±0.01 M⊙ and 0.09±0.01 M⊙. This discovery demonstrates that microlensing will provide a method to measure the mass function of all Galactic populations of very low mass binaries that is independent of the biases caused by the luminosity of the population.
U2 - 10.1088/0004-637X/723/1/797
DO - 10.1088/0004-637X/723/1/797
M3 - Journal article
SN - 0004-637X
VL - 723
SP - 797
EP - 802
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
ER -