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X-RAY SPECTRA FROM NEUTRON STARS ACCRETING AT LOW RATES

机译:中子星以低速率增长的X射线光谱

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摘要

The spectral properties of X-ray radiation produced in a static atmosphere around a neutron star accreting at very low rates are investigated. Previous results by Alme & Wilson are extended to the range 10~(-7) ≤ L/L_(Edd) ≤ 10~(-3) to include the typical luminosities, L~ 10~(31)-10~(32) ergs s~(-1), expected from isolated neutron stars accreting the interstellar medium. The emergent spectra show an overall hardening with respect to the blackbody at the neutron star effective temperature in addition to a significant excess over the Wien tail. The relevance of present results in connection with the observability of low-luminosity X-ray sources is briefly discussed.
机译:研究了在以极低速率吸积的中子星周围的静态大气中产生的X射线辐射的光谱特性。 Alme&Wilson先前的结果扩展到10〜(-7)≤L / L_(Edd)≤10〜(-3)的范围,以包括典型的光度L〜10〜(31)-10〜(32) ergs s〜(-1),预期是从吸收星际介质的孤立中子星产生的。出现的光谱显示在中子星有效温度下相对于黑体的整体硬化,此外在维恩尾部明显过量。简要讨论了与低发光度X射线源的可观察性相关的当前结果的相关性。

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