Printer Friendly

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 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 PSR1855+09, one of the "millisecond pulsars" with a pulse period of 5.3621004525 milliseconds.

The companion is a white dwarf star with a temperature of 5,900[deg.]K. that temperature implies that the pulsar 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, and that, Wright and Loh remark, could be a measure of the strength of the constant component of pulsar fields.
COPYRIGHT 1986 Science Service, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 1986, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:binary pulsar and white dwarf star
Publication:Science News
Date:Nov 29, 1986
Previous Article:Herpes and cholesterol buildup.
Next Article:Salt-sensitive genes.

Related Articles
Fastest pulsar so far.
Puzzling pulsar offers opportunities.
Pulsar cannibalizes companion.
Puzzling particle showers point to pulsars.
Shadow matter and 'black widow' pulsars.
Astronomers glimpse birth of a pulsar.
Cannibalizing pulsar lures astronomers.
A plenitude of pulsars.
Grappling with the globulars: a tale of cosmic eggbeaters and born-again pulsars.
Let there be spin: revving up neutron stars.

Terms of use | Copyright © 2017 Farlex, Inc. | Feedback | For webmasters