Parkes observations for project P880 semester 2015APRS

XSS J1227-4859 is the second "Transitional" pulsar binary system discovered in the galactic field. We plan to set up a campaign of observations at 50cm, 20cm, and 10cm with the aims of: (i) discriminating the various proposed mechanisms responsible for the orbital variations seen in the system; (ii) studying the time evolution and the nature of the radio eclipses; (iii) investigating the nature of the gamma-ray emission from the binary; (iv) determining the critical X-ray luminosity above which the pulsed radio emission disappears; (v) constraining the geometry of the emission from the system in the radio, X-ray and gamma-ray bands.

XSS J1227-4859是在银河系天区中发现的第二例“过渡态”脉冲星双星系统。我们计划实施针对该源的多波段观测项目，观测波段覆盖50厘米、20厘米与10厘米，旨在达成以下科学目标：（i）甄别该系统中已被提出的各类轨道变化成因机制；（ii）研究射电食变的时间演化特性与物理本质；（iii）探究该双星系统的伽马射线辐射本质；（iv）确定脉冲射电辐射消失的临界X射线光度；（v）约束该系统在射电、X射线与伽马射线波段的辐射几何结构。