Age of a millisecond binary pulsar
Article Abstract:
The age of the millisecond binary dwarf PSR J1012+5307 is around 7000 million years. The age of its companion white dwarf is 0.3 gigayears. The age is calculated using a version of the evolution code of Eggleton. The cooling time scale of a very-low-mass white dwarf (VLMWD) is higher due to the absence of thermal flashes. A VLMWD with a hydrogen envelope is unable to exhibit thermal flashes when hydrogen content in the envelope remains high and gives a much longer phase with considerable hydrogen burning.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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A large age for the pulsar B1757-24 from an upper limit on its proper motion
Article Abstract:
Research is presented concerning the differences between the characteristic age and the true age of pulsars. Issues concerning pulsar velocities, supernova explosions and neutron star structure and cooling are discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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Older than they look
Article Abstract:
Issues are presented concerning the methods employed to establish the age of pulsars and supernovas. The differences which exist between the true age and the characteristic age of pulsars are discussed.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 2000
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