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Pulsar's companion: a question of age.

Pulsar's companion: A question of age

Binary pulsars, systems in which pulsars orbit around companion stars, permit astrophysicists An astrophysicist is a person who professionally studies and conducts research in astrophysics. Famous astrophysicists
  • Hannes Olof Gösta Alfvén (Sweden, 1908 – 1995)
  • Subrahmanyan Chandrasekhar (India, USA, 1910 – 1995)
 to gain important information about the nature and evolution of pulsars, which are believed to be neutron stars. In the Nov. 13 NATURE, Gregory A. Wright and Edwin D. Loh of Princeton (N.J.) University report that they have found the companion of the binary pulsar PSR PSR Pulsar
PSR Poster
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1855+09, one of the "millisecond pulsars" with a pulse period of 5.3621004525 milliseconds.

The companion is a white dwarf star white dwarf star

Any of a class of small, faint stars representing the end point of the evolution of stars without enough mass to become neutron stars or black holes.
 with a temperature of 5,900[deg.]K. that temperature implies that the pulsar pulsar, in astronomy, a neutron star that emits brief, sharp pulses of energy instead of the steady radiation associated with other natural sources. The study of pulsars began when Antony Hewish and his students at Cambridge Univ.  is more than 2 billion years old. However, according to the "naive" theory, the pulsar's magnetic field, which poers its pulsations, should have decayed away to nothing after about 10 million years, and this pulsar ought no longer to be active.

A possible way out is a suggestion of Shrinivas R. Kulkarni of Caltech in Pasadena that pulsar fields have two components, one that decays and one that remains constant. The field of this pulsar is 340 million gauss gauss (gous) [for C. F. Gauss], abbr. G, unit of magnetic flux density (see flux, magnetic) equal to 0.0001 (10−4) weber per square meter. , and that, Wright and Loh remark, could be a measure of the strength of the constant component of pulsar fields.
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Title Annotation:binary pulsar and white dwarf star
Publication:Science News
Date:Nov 29, 1986
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