OGLE-2005-BLG-153: Microlensing Discovery and Characterization of a Very Low Mass Binary

OGLE-2005-BLG-153: Microlensing Discovery and Characterization of a Very Low Mass Binary

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...

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Veröffentlicht in:The Astrophysical journal 2010-11, Vol.723 (1), p.797-802, Article 797
Hauptverfasser: Hwang, K.-H, Udalski, A, C. Han, Ryu, Y.-H, Bond, I. A, Beaulieu, J.-P, Dominik, M, Horne, K, Gould, A, Gaudi, B. S, Kubiak, M, Szymański, M. K, Pietrzyński, G, Soszyński, I, Szewczyk, O, Ulaczyk, K, Wyrzykowski, Ł, Abe, F, Botzler, C. S, Hearnshaw, J. B, Itow, Y, Kamiya, K, Kilmartin, P. M, Masuda, K, Matsubara, Y, Motomura, M, Muraki, Y, Nakamura, S, Ohnishi, K, Okada, C, Rattenbury, N, Saito, To, Sako, T, Sasaki, M, Sullivan, D. J, Sumi, T, Tristram, P. J, Wood, J. N, Yock, P. C. M, Yoshioka, T, Albrow, M, Bennett, D. P, Bramich, D. M, Brillant, S, Caldwell, J. A. R, Calitz, J. J, Cassan, A, Cook, K. H, Corrales, E, Coutures, C, Desort, M, Dieters, S, Dominis, D, Donatowicz, J, Fouqué, P, Greenhill, J, Harpsøe, K, Hill, K, Hoffman, M, Jørgensen, U. G, Kane, S, Kubas, D, Martin, R, Marquette, J.-B, Meintjes, P, Menzies, J, Pollard, K, Sahu, K, Steele, I, Vinter, C, Wambsganss, J, Williams, A, Woller, K, Burgdorf, M, Snodgrass, C, Bode, M, Depoy, D. L, Lee, C.-U, Park, B.-G, Pogge, R. W
Format: Artikel
Sprache:eng
Schlagworte:
Astronomy
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Earth, ocean, space
Exact sciences and technology
HYDROGEN BURNING
LENSES
LUMINOSITY
MASS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
STAR BURNING
STARS
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Zusammenfassung: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.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/723/1/797