An eclipsing millisecond pulsar in the globular cluster Terzan 5
An eclipsing millisecond pulsar in the globular cluster Terzan 5
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DOI：
10.1038/347650a0
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发表时间：
1990-10
期刊：
影响因子：
64.8
通讯作者：
A. Lyne;R. Manchester;N. D'Amico;L. Staveley-Smith;Simon Johnston;Jeremy Lim;A. Fruchter;W. Goss;D. Frail
中科院分区：
文献类型：
--
作者：
A. Lyne;R. Manchester;N. D'Amico;L. Staveley-Smith;Simon Johnston;Jeremy Lim;A. Fruchter;W. Goss;D. Frail
我们在球状星团泰山5号中发现了一颗食双星毫秒脉冲星。这是继PSR1957 + 20之后第二颗已知的食双星脉冲星，脉冲周期为11.56毫秒，轨道周期非常短，只有1.8小时。与PSR1957 + 20相比，在PSR1957 + 20中，日食占据了轨道周期的10%，而这颗脉冲星的日食持续时间变化很大，从不少于轨道周期的三分之一。这颗脉冲星位于半径为0.11光秒的圆形轨道上，这意味着它的最小伴星质量为0.089太阳质量，大约是PSR1957 + 20伴星质量的4倍。时间观测表明，这颗脉冲星在星团中心以西约30弧秒处有一个可变连续源。这些观测和日食持续时间的变化表明，日食是由于从伴星流出的微弱风的吸收或散射造成的。我们还在泰山5号方向发现了第二颗脉冲星。这颗周期为442毫秒的脉冲星也可能是星团的成员，但更有可能是前景天体。
WE HAVE discovered an eclipsing binary millisecond pulsar in the globular cluster Terzan 5. This, the second known eclipsing binary pulsar after PSR1957 + 20, has a pulse period of 11.56 ms and a very short orbital period of 1.8 hours. In contrast to PSR1957 + 20, where the eclipses occupy about 10 per cent of the orbital period1, the eclipse duration in this pulsar is very variable and never less than one-third of the orbital period. The pulsar is in a circular orbit of radius 0.11 light seconds, which implies a minimum companion mass of 0.089 solar masses, about four times the companion mass of PSR1957 + 20. Timing observations suggest an identification of the pulsar with a variable continuum source locate about 30 arcsec west of the cluster centre. These observations and the variable eclipse duration show that the eclipse is due to absorption or scattering in a tenuous wind which flows from the companion star. We have also detected a second pulsar in the direction of Terzan 5. This pulsar, which has a period of 442 ms,may also be a cluster member, but is more likely to be a foreground object.