GRO J1744-28: Last Gasps of a Dying Low-mass X-ray Binary

Details GRO J1744-28: Last Gasps of a Dying Low-mass X-ray Binary GRO J1744-28: Last Gasps of a Dying Low-mass X-ray Binary

1996-04-16

arxiv.org/abs/astro-ph/9604089v1

Astronomy and Astrophysics

Astrophysics

10 pages, plain TeX, submitted on February 9 to ApJ Letters

Scientific paper

We argue that the bursting, transient X-ray source GRO J1744-28 is a binary consisting of a very low-mass ($M \approx 0.2 M_\sun$), highly evolved giant star that is transferring mass by Roche lobe overflow onto a high-mass ($M \approx 1.8 M_\sun$) neutron star. We explore a picture in which the bursts are due to thermonuclear flashes in matter that has accreted onto the neutron star. We attribute the unusually hard spectra of the bursts and the high burst rate compared to normal Type I X-ray burst sources -- indeed the existence of unstable nuclear burning itself -- to the unusually strong surface magnetic field, $ B_s \approx 1 \times 10^{13}$ G, of the neutron star.

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