The binary pulsar: physical processes, possible companions, and evolutionary histories.
The binary pulsar: physical processes, possible companions, and evolutionary histories.
复制标题
双脉冲星：物理过程、可能的伴星和演化历史。
DOI：
10.1086/154524
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发表时间：
1976
期刊：
影响因子：
--
通讯作者：
R. Blandford
中科院分区：
文献类型：
--
作者：
L. Smarr;R. Blandford
根据最近报道的观测结果，对脉冲双星PSR 1913+16的某些方面进行了研究。如果脉冲星的伴星对观测到的拱点运动有牛顿贡献（一颗氦星星或一颗旋转的白色矮星），那么它就可能是可观测的：前者可以通过光学或星风的色散效应观测到，后者可以通过观测到的轨道倾角的长期变化观测到。如果另一种选择，伴星的动力学行为是一个点质量（仅由广义相对论引起的拱点运动），O（... nu../ c）/sup 2/频移将提供组件质量的测量。此外，随着计时精度的十倍提高，开普勒椭圆的后牛顿修正和像差的影响原则上可以测量。这样就可以确定脉冲星自转轴的方向，并使大地自转岁差的观测成为广义相对论的检验。我们还检验了基于引力辐射引起的轨道周期变化的检验，并讨论了可能的演化历史。目前最可能的系统由两颗中子星组成，这是X射线双星相和双核星星相的最终结果。在这种情况下，PSR 1913+16的长时间年龄和短周期被证明是相互关联的，如果脉冲星是第一个中子星星形成。为了表明在进化的基础上不排除其他的伴星，我们构建了导致He星星、白色矮星或黑洞伴星的交替历史。(AIP)«少
A study of some aspects of the binary pulsar, PSR 1913+16, is presented in the light of recently reported observational results. If the companion to the pulsar gives a Newtonian contribution to the observed apsidal motion (a helium star or a rotating white dwarf), then it will probably be observable: the former either optically or through the dispersive effects of a stellar wind, and the latter through a secular change in the observed inclination of the orbit. If alternatively the companion behaves dynamically as a point mass (apsidal motion caused solely by general relativity), observations of the O (..nu../c)/sup 2/ frequency shift will furnish a measurement of the masses of the components. In addition, with a tenfold improvement in timing accuracy, the post-Newtonian corrections to the Keplerian ellipse and the effects of aberration could in principle be measured. This would then provide a determination of the orientation of the pulsar spin axis and allow the observation of geodetic spin precession to become a test of general relativity. We also examine the test based on the detection of orbital period changes due to gravitational radiation.Possible evolutionary histories are discussed. The most probable present system consists of two neutron stars, the endmore » result of an X-ray binary phase followed by a double core star phase. In this scenario the long timing age and short period of PSR 1913+16 are shown to be interrelated if the pulsar was the first neutron star formed. To show that other companions are not ruled out on evolutionary grounds, we construct alternate histories leading to either He star, white dwarf, or black hole companions. (AIP)« less