Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...149l..27l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 149, no. 2, Aug. 1985, p. L27-L29. Research supported by the John Simon Guggen
Astronomy and Astrophysics
Astrophysics
26
Neutron Stars, Stellar Evolution, Stellar Spectra, X Ray Binaries, Accretion Disks, Field Strength, Galactic Bulge, Giant Stars, Stellar Magnetic Fields, Stellar Mass
Scientific paper
It is generally assumed in the interpretation of X-ray spectra of low mass X-ray binaries that the accreting neutron stars are very weakly magnetized. It is pointed out that this assumption may not be correct in low mass X-ray binary systems where the companion (donor) star is evolved. In these systems, the magnetic dipole field strength of the neutron star could be of order 10 to the 10th G, in which case the inner part of the accretion disk would terminate at the magnetosphere and not on the surface of the neutron star. This could invalidate some (perhaps all) recent interpretations of the so-called 'two-component' X-ray spectra for low mass binaries with an evolved companion (such as, e.g., Sco X-I, GX 5-1, and several other very bright galactic bulge sources) where it is assumed that one of the two spectral components comes from a boundary layer at which the accretion disk touches the neutron star surface.
Lewin Walter H. G.
Paradijs Jan van
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