The astrophysics of accretion in compact binaries

致密双星吸积的天体物理学

• 批准号: PP/D005914/1
• 负责人: Danny Steeghs
• 金额: $ 52.29万
• 依托单位: University of Warwick
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2007
• 资助国家: 英国
• 起止时间: 2007 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=PP%2FD005914%2F1
• 关键词: astrophysics; accretion; compact; binaries

Unlike our Sun, the majority of stars find themselves in gravitationally bound pairs known as binary stars. The interaction between the two stars often leads to the formation of a compact pair with the lower mass donor star losing mass onto the more massive primary. Such interactions can produce very energetic objects as the potential energy that is released is converted into radiation and heat. The most extreme examples contain a very small but massive remnant of a star, which can be either a white dwarf for a star the mass of our Sun, or a neutron star or black hole for more massive stars. These two stars can orbit around each other in as little as a few minutes. I propose to employ novel imaging techniques, which are very similar to the CAT scanning methods used in hospitals, in order to study this interaction using the latest telescopes and instruments. This allows us to reconstruct images and even movies that show this interaction in detail despite the fact that such double stars are not resolved in even our biggest telescopes. I will use these reconstructed images of binaries to study the wide variety of physical processes that occur in these systems. These include turbulence, tidal interactions, outflows and jets, relativistic physics near black holes and the structure of matter under extreme conditions. My work relies on exploiting the latest suite of ground-based telescopes in conjunction with space-based observations at wavelengths that are not accessible from earth. In order to determine how binaries affect the populations of stars in galaxies such as our Milky Way, I also intend to search for many new systems using wide-field digital cameras attached to large telescopes. This combination will allow me to test our current ideas concerning the formation, structure and time evolution of a wide range of binary systems.

与我们的太阳不同，大多数恒星都是由引力束缚的双星。两颗恒星之间的相互作用通常会导致形成致密的双星，质量较低的恒星会失去质量而转向质量较大的主星。这种相互作用可以产生非常有能量的物体，因为释放的势能被转换成辐射和热量。最极端的例子包括一颗非常小但质量巨大的恒星残骸，对于太阳质量的恒星来说，它可能是白矮星，对于质量更大的恒星来说，它可能是中子星或黑洞。这两颗恒星可以在短短几分钟内围绕彼此运行。我建议采用新颖的成像技术，与医院使用的CAT扫描方法非常相似，以便使用最新的望远镜和仪器研究这种相互作用。这使我们能够重建图像，甚至是详细展示这种相互作用的电影，尽管事实上，即使是我们最大的望远镜也无法分辨出这样的双星。我将使用这些重建的二进制图像来研究这些系统中发生的各种物理过程。其中包括湍流、潮汐相互作用、外流和射流、黑洞附近的相对论物理以及极端条件下的物质结构。我的工作依赖于利用最新的地面望远镜，并结合从地球上无法获得的波长的太空观测。为了确定双星是如何影响银河系等星系中的恒星数量的，我还打算使用连接在大型望远镜上的宽视场数码相机来搜索许多新的系统。这种结合将使我能够测试我们目前关于大范围双星系统的形成、结构和时间演化的想法。

项目成果

Optical spectroscopy of the quiescent counterpart to EXO???0748???676

EXO 静态对应物的光谱？？？0748???676

• DOI: 10.1111/j.1365-2966.2009.15395.x
• 发表时间: 2009
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Bassa C

Remarkable spectral variability on the spin period of the accreting white dwarf in V455 And

V455 和 V455 中吸积白矮星自旋周期的显着光谱变化

• DOI: 10.1093/mnras/sts622
• 发表时间: 2013
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Bloemen S

IDENTIFICATION OF FIVE INTERACTING BINARIES IN THE GALACTIC BULGE SURVEY

银河核球勘测中五个相互作用的双星的识别

• DOI: 10.1088/0004-637x/769/2/120
• 发表时间: 2013
• 期刊: The Astrophysical Journal
• 作者: Britt C

IDENTIFICATION OF A POPULATION OF X-RAY-EMITTING MASSIVE STARS IN THE GALACTIC PLANE

银河系平面上发射 X 射线的大质量恒星群的识别

• DOI: 10.1088/0004-637x/727/2/105
• 发表时间: 2011
• 期刊: The Astrophysical Journal
• 作者: Anderson G

ULTRACAM photometry of the ultracompact binaries V407 Vul and HM Cnc

• DOI: 10.1111/j.1365-2966.2006.11244.x
• 发表时间: 2006-11
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: S. Barros;T. Marsh;V. Dhillon;P. Groot;S. Littlefair;G. Nelemans;G. Roelofs;D. Steeghs;P. Wheat