Optical and radio observations of the binary pulsar 1855 + 09 - Evolution of pulsar magnetic fields and low-mass white dwarf cooling

Details Optical and radio observations of the binary pulsar 1855 + 09 - Evolution of pulsar magnetic fields and low-mass white dwarf cooling Optical and radio observations of the binary pulsar 1855 + 09 - Evolution of pulsar magnetic fields and low-mass white dwarf cooling

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...367..221k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 367, Jan. 20, 1991, p. 221-227. Research supported by California Institute

Astronomy and Astrophysics

Astronomy

30

Binary Stars, Pulsars, Radio Observation, Stellar Magnetic Fields, Visual Observation, White Dwarf Stars, Neutron Stars, Radio Sources (Astronomy), Stellar Evolution, Stellar Mass

Scientific paper

New radio and optical observations of the 5.4 ms binary pulsar 1855 + 09 are reported. The visual extinction of the system is shown to be about 1.5 mag. Only one star brighter than R about 24.6 is found that, on the basis of positional coincidence, can be plausibly the optical counterpart of the secondary star. The spectrum of this candidate is inconsistent with a low-mass main-sequence star. Neither is it a white dwarf because the spectroscopic distance modulus is inconsistent with the lower limit on distance obtained from timing observations. It is concluded that the companion of PSR 1855 + 09 must be a low-mass cold white dwarf. The inferred cooling age supports the hypothesis that magnetic field strengths of millisecond pulsars are essentially constant and that millisecond pulsars are long-lived objects.

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