Some Aspects of Low-Mass Close Binary Models for Bright Galactic Bulge X-Ray Sources and 4U1626-67

Astronomy and Astrophysics – Astrophysics

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Scientific paper

Assuming that gravitational radiation loss is the driving mechanism for mass transfer in the brightest galactic bulge X-ray sources various conditions are examined in order to obtain the highest possible mass-transfer rates.
It is found that even if angular momentum losses from the disk are taken into account, only in case of a degenerate star as secondary the mass-transfer rate can reach values as high as are required to explain the highest observed luminosities of these sources. The 2500 sec orbital period of 4U 1626 - 67 seems to require a hydrogen-rich low-mass degenerate secondary star.

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