Companion star of a binary millisecond pulsar

Computer Science

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Binary Stars, Companion Stars, Pulsars, Stellar Evolution, Stellar Temperature, White Dwarf Stars, Data Reduction, Isophotes, Main Sequence Stars, Pixels, Stellar Color, Stellar Spectrophotometry

Scientific paper

The authors have searched for and identified the companion star of the recently discovered binary millisecond pulsar PSR 1855+09. The optical counterpart is compatible with a 0.3 M_sun; white dwarf with a surface temperature of ≡5,900K. This is in accord with currently accepted ideas on the genesis of such a fast binary pulsar. The low temperature of the white dwarf implies that the system is >109yr old. Such an old pulsar is not easily accounted for by the conventional theory, in which the pulsar ceases to be active after its magnetic field decays, a process believed to take ≡107yr.

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