Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe..10b&link_type=abstract
"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #1
Astronomy and Astrophysics
Astrophysics
Scientific paper
Significant orbital evolution has been measured in transient and persistent LMXBs. In particular, the eclipsing X-ray pulsar 2A1822-371, and the transient accreting millisecond pulsar SAXJ1808.4-3658 show orbital expansion at a rate exceeding by more than one order of magnitude what is expected from secular evolution driven by angular momentum losses caused by magnetic braking or gravitational radiation under the hypothesis of conservative mass transfer. We propose an explanation of this puzzling result assuming that these systems are ejecting matter (and angular momentum) from the inner Lagrangian point, suggesting an highly non-conservative evolution. Radiation pressure -- from Eddington-limited accretion in 2A1822-371, and from a rotating magnetic dipole in SAXJ1808.4-3658 -- causes severe losses in the matter overflowing the companion Roche-lobe. We discuss the consequences of this behaviour in the general context of LMXBs evolutionary scenarios.
Burderi Luciano
di Salvo Tiziana
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