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Modeling of Oxygen-Neon Dominated Accretion Disks in Ultracompact X-Ray Binaries: 4U 1626-67

  • K. Werner (a1), T. Nagel (a1), S. Dreizler (a2) and T. Rauch (a1) (a3)

Abstract

We report on first results of computing synthetic spectra from H/He-poor accretion disks in ultracompact LMXBs. We aim at the determination of the chemical composition of the very low-mass donor star, which is the core of a former C/O white dwarf. The abundance analysis allows to draw conclusions on gravitational settling in WDs which is an important process affecting cooling times and pulsational g-mode periods.

Resumen

Presentamos los primeros resultados computacionales de espectros sintéticos de discos de acreción pobres en H/He on ultracompactas LMXBs. Nuestro objetivo es la determinación de la composición química de la estrella donadora do muy baja masa que forma el núcleo de lo que fue una enana blanca C/O. El análisis de abundancias nos pemite obtener conclusiones sobre el asentamiento gravitacional en WDs, un importante proceso que afecta a los tioiupos de enfriamiento y a los períodos pulsantes de los modos g.

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References

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