arXiv 1009.03442010-09astro-ph.SR

OGLE-2005-BLG-153：极低质量双星的微透镜发现和表征

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

K. -H. Hwang, A. Udalski, C. Han, Y. -H. Ryu, I. A. Bond, J. -P. Beaulieu, M. Dominik, K. Horne, A. Gould, B. S. Gaudi, M. Kubiak, M. K. Szymanski, G. Pietrzyns… 展开作者

K. -H. Hwang, A. Udalski, C. Han, Y. -H. Ryu, I. A. Bond, J. -P. Beaulieu, M. Dominik, K. Horne, A. Gould, B. S. Gaudi, M. Kubiak, M. K. Szymanski, G. Pietrzynski, I. Soszynski, O. Szewczyk, K. Ulaczyk, L. Wyrzykowski, F. Abe, C. S. Botzler, J. B. Hearnshaw, Y. Itow, K. Kamiya, P. M. Kilmartin, K. Masuda, Y. Matsubara, M. Motomura, Y. Muraki, S. Nakamura, K. Ohnishi, C. Okada, N. Rattenbury, To. Saito, T. Sako, M. Sasaki, D. J. Sullivan, T. Sumi, P. J. Tristram, J. N. Wood, P. C. M. Yock, T. Yoshioka, M. Albrow, D. P. Bennett, D. M. Bramich, S. Brillant, J. A. R. Caldwell, J. J. Calitz, A. Cassan, K. H. Cook, E. Corrales, C. Coutures, M. Desort, S. Dieters, D. Dominis, J. Donatowicz, P. Fouque, J. Greenhill, K. Harpsoe, K. Hill, M. Hoffman, U. G. Jorgensen, S. Kane, D. Kubas, R. Martin, J. -B. Marquette, P. Meintjes, J. Menzies, K. Pollard, K. Sahu, I. Steele, C. Vinter, J. Wambsganss, A. Williams, K. Woller, M. Burgdorf, C. Snodgrass, M. Bode, D. L. Depoy, C. -U. Lee, B. -G. Park, R. W. Pogge

备注：: 6 pages, 3 figures, 1 table
DOI：: 10.1088/0004-637X/723/1/797

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摘要：

双星的质量函数和统计数据提供了恒星形成过程的重要诊断。尽管如此重要，低质量下的质量函数仍然知之甚少，这是由于物体的模糊造成的观测困难。在这里，我们报告的微透镜的发现和表征的二元透镜组成的非常低的质量恒星略高于氢燃烧的限制。从爱因斯坦半径和微透镜视差的联合测量，我们测量的质量的二进制组件的$0.10\pm 0.01\ M_\odot$和$0.09\pm 0.01\ M_\odot$。这一发现表明，微透镜将提供一种方法来测量所有银河系极低质量双星的质量函数，这种方法独立于由人口光度引起的偏差。

英文摘要：

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 $0.10\pm 0.01\ M_\odot$ and $0.09\pm 0.01\ M_\odot$. 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.

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