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Applications of infrared imaging interferometry: Binaries, rapid rotators, and hot Jupiters.

机译：红外成像干涉仪的应用：双星，快速旋转器和热木星。

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摘要

Long baseline optical inerferometers now have the power to resolve objects as small as 0.5 milliarcseconds in the near-IR and possess the capability of conducting real aperture synthesis imaging, allowing us to study stars and their environments in unprecedented detail. As a fundamental property of stars, rotation affects stars' luminosities, effective temperatures, and their evolution. Since most of hot stars are rapid rotators, understanding the effects of rotation will shed light on critical areas of stellar evolution and basic astrophysics. Using the CHARA array and the MIRC combiner, we resolved the surfaces of three rapid rotators, alpha Cep, alpha Oph and Altair. We reconstructed an image for alpha Cep, and modeled the surface brightness distribution for all three stars, allowing us to confirm the "gravity darkening" phenomenon and investigate the impact of rapid rotation on their locations in the H-R diagram. Our modeling of rapid rotators also allowed us to propose a new way of measuring masses of stars.;We also studied binary stars with IR interferometers. We conducted combined interferometric and spectroscopic study of the metallic-lined A star lambda Vir, permitting us to determine its orbital and physical properties to high accuracy. The determination of masses of the system also allowed us to compare observations with stellar evolution models, in which reasonable matches were found. In addition, using CHARA-MIRC we also made the first resolved images of the well-known interacting and eclipsing binary system beta Lyrae, which also allowed us to obtain its full orbital parameters and estimate the masses of its components.;Lastly, we present our efforts toward direct detection of nearby hot Jupiters using precision closure phases obtained with long baseline interferometer. We present closure phase simulations, preliminary observations on the hot Jupiter system upsilon And, as well as calibration studies and test observations of a high contrast binary epsilon Per. We conclude that with all the ongoing improvements, it is feasible to achieve the goal of detecting hot Jupiters with CHARA-MIRC.
机译：长基线光学干涉仪现在可以分辨近0.5毫秒的小物体，并具有进行真实孔径合成成像的能力，从而使我们能够以前所未有的细节研究恒星及其周围环境。作为恒星的基本属性，自转会影响恒星的亮度，有效温度及其演化。由于大多数热星都是快速自转的，因此了解自转的影响将为恒星演化和基本天体物理学的关键领域提供启示。使用CHARA阵列和MIRC组合器，我们解析了三个快速旋转器（alpha Cep，alpha Oph和Altair）的表面。我们为alpha Cep重建了图像，并为所有三颗恒星建模了表面亮度分布，从而使我们能够确认“重力变暗”现象，并研究快速旋转对其在H-R图中的位置的影响。我们对快速旋转器的建模还使我们能够提出一种测量恒星质量的新方法。我们还使用红外干涉仪研究了双星。我们对衬有金属的A星λVir进行了干涉和光谱相结合的研究，从而使我们能够高精度地确定其轨道和物理性质。系统质量的确定也使我们能够将观测值与恒星演化模型进行比较，在恒星演化模型中找到了合理的匹配项。此外，使用CHARA-MIRC，我们还制作了著名的相互作用和日食双星系统β天琴座的第一个分解图像，这也使我们能够获得其完整的轨道参数并估计其分量的质量。我们努力通过使用长基线干涉仪获得的精密封闭相直接检测附近的热木星。我们介绍了封闭阶段的模拟，对热木星系统upsilon的初步观察以及高对比度二元εPer的校准研究和测试观察。我们得出结论，通过所有正在进行的改进，可以实现使用CHARA-MIRC检测热木星的目标。

著录项

  • 作者

    Zhao, Ming.;

  • 作者单位

    University of Michigan.;

  • 授予单位 University of Michigan.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 214 p.
  • 总页数 214
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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