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本文从极冠模型出发导出辐射束的强度分布和新的光度公式.新的光度公式无需对磁倾角和视线扫过辐射束的部位作出假定,采用新的射电光度值来研究光度的演化规律,发现在周期和周期变率的整个取值范围内射电光度可以用关系式L∝(B/P2)1.1和L∝Q’-1.4来描写.这和近几年流行的光度规律不同. 相似文献
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The state of super-dense matter is essential for us to understand the nature of pulsars; however, non- perturbative quantum chromodynamics makes it very difficult to make direct calculations of the state of cold matter at realistic baryon number densities inside compact stars. Nevertheless, from an observational point of view, it is conjectured that pulsars could be made up of quark clusters since the strong coupling between quarks might render the quarks to be grouped in clusters. In this paper, we attempt to find an equation of state of condensed quark-cluster matter in a phenomenological way. Supposing that the quark-clusters could be analogized to inert gases, we apply here the corresponding-state approach to derive the equation of state of quark-cluster matter, as was similarly demonstrated for nuclear and neutron-star matter in the 1970s. According to the calculations that we have presented, the quark-cluster stars, which are composed of quark-cluster matter, could have a high maximum mass that is consistent with observations and, in turn, further observations of pulsar mass could also place a constraint on the properties of quark-cluster matter. We will also briefly discuss the melting heat during the solid-liquid phase conversion and its related astrophysical consequences. 相似文献
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Anomalous x-ray pulsars (AXPs) and soft gamma-ray repeaters (SCRs) are believed to be candidates for magnetars, and they are powered by the decay of ultra-strong magnetic fields of〉 1014 C. From the modified spin-down relation of pulsars P ∝P^2-n, we find that the Vela pulsar would evolve into the classes of magnetars under some assumptions that pulsars lose their rotational energy only by magnetic dipole radiation and the braking index is a constant. Our rough calculation indicates that only pulsars with n - 1.3 - 1.6 can evolve into magnetars. Pulsars like Vela with a low braking index may be the progenitors of AXPs and SCRs. Regarding the mechanism evolved into magnetars, we suggest that pulsars' surface magnetic field component may be increased by frequent glitches. 相似文献
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很容易确定天体物理诞生的日子,也很容易确定现代宇宙学诞生的日子.前者由基尔霍夫的太阳光谱观测确定,后者由爱因斯坦发表第一个宇宙解确定。但是,很难确定高能天体物理诞生的日子.也许可以作为高能天体物理诞生标志的是巴德和兹威基于1934年发表的一篇论文,题目为《超新星和宇宙线》. 相似文献
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