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Radio observations of binary pulsars: Clues to binary evolution and tests of general relativity.

机译：二元脉冲星的无线电观测：二元演化的线索和广义相对论的检验。

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摘要

We have carried out pulse timing experiments on nine radio pulsars in binary systems to obtain refined rotational, astrometric, and orbital information. We discuss the implications of our results for theories of binary evolution and relativistic gravity.; We have detected non-monotonic orbital period changes in the PSR B1957+20 system similar to those observed in other close binaries but previously unknown in a pulsar system; such orbital variability may imply that the pulsar's low-mass companion is magnetically active or may be the result of variable mass loss from the companion's surface, which is heated by radiation from the pulsar. These observations challenge existing scenarios of the companion's destruction in a system believed to be the evolutionary link between low-mass X-ray binaries and isolated millisecond pulsars.; Binary pulsars are believed to be ideal laboratories for studying the nature of the gravitational interaction in the strong-field regime. A number of systems serve as useful testing grounds for the Strong Equivalence Principle: we set improved bounds on the existence of dipolar gravitational radiation, time-variability of the universal constant of gravitation G, and the differential acceleration of strongly self-gravitating objects in an external gravitational field. Within the framework of general relativity, our measurements of the periastron advance rates in the PSR B1802{dollar}-{dollar}07 and B2303+46 systems yield the total mass of each system and constrain the individual masses of their components--such mass measurements constrain both models of binary evolution in high-mass systems and theories of neutron star structure. We update timing results for the relativistic binary pulsar B1534+12, and present polarization measurements which describe the shape and geometry of its radio beam. We detect a gradual long-term change in the pulse shape of PSR B1534+12, evidence for relativistic precession of the pulsar spin axis.
机译：我们已经在二元系统中的九个无线电脉冲星上进行了脉冲定时实验，以获得精确的旋转，天文和轨道信息。我们讨论了我们的结果对二元进化和相对论引力理论的启示。我们已经在PSR B1957 + 20系统中检测到非单调的轨道周期变化，类似于在其他近距离双星系统中观察到的变化，但以前在脉冲星系统中未知。这种轨道变异性可能意味着脉冲星的低质量伴星具有磁性，或者是由于伴星体表面质量的可变质量损失的结果，质量损失是由脉冲星的辐射加热而来的。这些观察挑战了在一个被认为是低质量X射线双星和孤立的毫秒脉冲星之间的进化联系的系统中，伴随物被破坏的现有情况。二元脉冲星被认为是研究强场条件下引力相互作用性质的理想实验室。许多系统可以作为强等价原理的有用测试基础：我们对偶极引力辐射的存在，万有引力的常数G的时变以及强自引力物体在物体中的微分加速度设置了更好的界限。外部引力场。在广义相对论的框架内，我们对PSR B1802 {dollar}-{dollar} 07和B2303 + 46系统中的天体推进速率的测量得出每个系统的总质量，并限制了其各个组成部分的质量-这样的质量测量限制了高质量系统中的双星演化模型和中子星结构理论。我们更新了相对论双星脉冲星B1534 + 12的计时结果，并提供了描述其无线电波形状和几何形状的极化测量结果。我们检测到PSR B1534 + 12的脉冲形状逐渐发生长期变化，这是脉冲星自旋轴相对论进动的证据。

著录项

  • 作者

    Arzoumanian, Zaven.;

  • 作者单位

    Princeton University.;

  • 授予单位 Princeton University.;
  • 学科 Physics Astronomy and Astrophysics.; Physics General.
  • 学位 Ph.D.
  • 年度 1995
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;物理学;
  • 关键词

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