Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements**Based on observations made with the NASA/ESA Hubble Space Telescope, obtained by the Space Telescope Science Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 091.D-0489(A) and 093.D-0522(A). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.
文献类型：期刊论文
| 作者 | Kains,N.1; Calamida,A.1; Sahu,K. C.1; Casertano,S.1; Anderson,J.1; Udalski,A.2; Zoccali,M.3,4; Bond,H.1,5; Albrow,M.6; Bond,I.7 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-07-14 |
| 卷号 | 843期号:2 |
| 关键词 | astrometry gravitational lensing: micro stars: black holes stars: general |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/aa78eb |
| 英文摘要 | Abstract We report on the first results from a large-scale observing campaign aiming to use astrometric microlensing to detect and place limits on the mass of single objects, including stellar remnants. We used the Hubble Space Telescope to monitor stars near the Galactic Center for three years, and we measured the brightness and positions of ～2 million stars at each observing epoch. In addition to this, we monitored the same pointings using the VIMOS imager on the Very Large Telescope. The stars we monitored include several bright microlensing events observed from the ground by the OGLE collaboration. In this paper, we present the analysis of our photometric and astrometric measurements for six of these events, and derive mass constraints for the lens in each of them. Although these constraints are limited by the photometric precision of ground-based data, and our ability to determine the lens distance, we were able to constrain the size of the Einstein ring radius thanks to our precise astrometric measurements—the first routine measurements of this type from a large-scale observing program. This demonstrates the power of astrometric microlensing as a tool to constrain the masses of stars, stellar remnants, and, in the future, extrasolar planets, using precise ground- and space-based observations. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-843-2-AA78EB |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/35931]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA 2.Warsaw University Observatory, Al.?Ujazdowskie?4, 00-478?Warszawa, Poland 3.Pontificia Universidad Católica de Chile, Instituto de Astrofisica, Av. Vicu?a Mackenna 4860, Santiago, Chile 4.Millennium Institute of Astrophysics, Av. Vicu?a Mackenna 4860, 782-0436 Macul, Santiago, Chile 5.Department of Astronomy & Astrophysics, Pennsylvania State University, University Park, PA 16802, USA 6.University of Canterbury, Dept. of Physics and Astronomy, Private Bag 4800, 8020 Christchurch, New Zealand 7.Institute of Natural and Mathematical Sciences, Massey University, Auckland 0745, New Zealand 8.SUPA, School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK 9.CCS-2, Los Alamos National Laboratory, Los Alamos, NM 87545, USA 10.Department of Physics and Astronomy, University of Nevada, Las Vegas, 4505 South Maryland Parkway, Las Vegas, NV 89154, USA |
| 推荐引用方式 GB/T 7714 | Kains,N.,Calamida,A.,Sahu,K. C.,et al. Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements**Based on observations made with the NASA/ESA Hubble Space Telescope, obtained by the Space Telescope Science Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 091.D-0489(A) and 093.D-0522(A). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.[J]. The Astrophysical Journal,2017,843(2). |
| APA | Kains,N..,Calamida,A..,Sahu,K. C..,Casertano,S..,Anderson,J..,...&Rejkuba,M..(2017).Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements**Based on observations made with the NASA/ESA Hubble Space Telescope, obtained by the Space Telescope Science Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 091.D-0489(A) and 093.D-0522(A). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555..The Astrophysical Journal,843(2). |
| MLA | Kains,N.,et al."Microlensing Constraints on the Mass of Single Stars from HST Astrometric Measurements**Based on observations made with the NASA/ESA Hubble Space Telescope, obtained by the Space Telescope Science Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 091.D-0489(A) and 093.D-0522(A). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.".The Astrophysical Journal 843.2(2017). |
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