Effect of the neutron star size on the total spectrum from LMXB

Agata Różańska, Bartosz Bełdycki, Jerzy Madej and Tek P. Adhikari

We show how shape of the spectrum of a non-spherical system as low mass X-ray binary (LMXB) depends on the size of the neutron star. We computed the continuum emission from system of axial symmetry as a neutron star with an accretion disk, which is a typical configuration for LMXB. Adopting the standard disk model, we expect that such disk is hot with the inner disk temperature of the order of 10⁷ K. In addition, the neutron star usually may be hot up to few×10⁷K. Therefore, the whole system is visible in UV/X-ray energy domain and the overall spectral shape may display double bump which is frequently observed in accreting sources. We show that systems with neutron stars of larger radii are brighter. An overall shape of emitting continuum depends on viewing angle in the whole energy range.

Proceedings of the Polish Astronomical Society, vol. 7, 285-290 (2018)

Download full article as PDF file: