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Astron. Astrophys. 363, 657-659 (2000)

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The eclipsing binary millisecond pulsar PSR B1744-24A - possible test for a magnetic braking mechanism

E. Ergma 1 and M.J. Sarna 2

1 Tartu University, Physics Department, Ülikooli 18, 2400 Tartu, Estonia (ene@physic.ut.ee)
2 Polish Academy of Sciences, N. Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland (sarna@camk.edu.pl)

Received 16 June 2000 / Accepted 22 September 2000

Abstract

As presented by Nice et al. (2000), long-term timing of the eclipsing binary PSR B1744-24A shows that the orbital period of this system decreases with a time-scale of only [FORMULA] 200 Myr. To explain the much faster orbital period decay than that predicted by only emission of the gravitational waves ([FORMULA] 1000 Myr) we propose that the orbital evolution of this system is also driven by magnetic braking. If magnetic braking is to explain the rapid decay of the orbit, then [FORMULA] characterizing the effectiveness of the dynamo action in the stellar convection zone in the magnetic stellar wind formula must be equal to 1.

Key words: stars: binaries: close – stars: binaries: general – stars: mass-loss – stars: pulsars: general – stars: pulsars: individual: B1744-24A

Send offprint requests to: E. Ergma

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© European Southern Observatory (ESO) 2000

Online publication: December 11, 2000
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