Dating supernova remnants
Article Abstract:
The pulsar PSR1509-58 and the nearby supernova remnant MSH15-52 have been tentatively linked with the 'guest star' that Chinese astronomers observed in 185 AD. S.E. Thorsett argues that the phenomenon seen by the Chinese was really a supernova or exploding star, which created both the remnant and the pulsar seen today. This identification, if confirmed, would be important since it would settle the age of this supernova remnant and help to test theories as to how pulsars and supernova remnants evolve.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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Star formation and the origin of stellar masses
Article Abstract:
Stars may form when the protostar within a condensing core of molecular gas is forced out by interacting with another protostar or star. This model of star formation produces a simulated distribution of stellar masses that matches well with the known mass function of stars. The competition between accretion and collision rates sets the general form of the mass function in this model and accounts for the variations in the galactic placement of stars.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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A radio pulsar with an 8.5-second period that challenges emission models
Article Abstract:
Rotating neutron stars emit beams of radio waves from areas above their magnetic poles. Theories of the emission mechanism involve continuous electron-positron pair production. The pulsar J2144-3933 is shown to have a period of 8.51 s, the longest of any known radio pulsar. Based on the neutron-start equations of state, such a pulsar should not be emitting a radio beam, and current theories may have to be revised.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1999
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