X. W. Liu, R. X. Xu, G. J. Qiao, J. L. Han, Z. W. Han, X. D. Li
The spin evolution of the compact neutron core in a Thorne-Zytkow Object (TZO) is investigated to explore the origin of extremely long period X-ray source. It is found that the outflow would effectively take away angular momentum from the core when radiation pressure dominates the accretion process. Thus the compact core could quickly spin-down to the co-rotation period (e.g. several hours) within the massive envelope, in about 10^3 - 10^4 years. The compact core could become an extremely long period compact star if the envelope is disrupted by some powerful bursts or exhausted via the stellar wind. The 6.67-hour periodic modulation of the central compact object (CCO) in supernova remnant RCW 103 could be naturally understood as the descendant of a TZO.
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http://arxiv.org/abs/1207.4687
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