On the nature of the compact star in 4U 1728-34

Ignazio Bombaci; Jishnu Dey; Mira Dey; Subharthi Ray; Xiang-Dong Li

On the nature of the compact star in 4U 1728-34

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arxiv astro-ph/9908274 v1 pith:KGR6Q57G submitted 1999-08-25 astro-ph

Xiang-Dong Li , Subharthi Ray , Jishnu Dey , Mira Dey , Ignazio Bombaci This is my paper

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keywords qposstarlmxbsmodelx-rayatollbinariescompact

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The discovery of kilohertz quasi-periodic oscillations (kHz QPOs) in low-mass X-ray binaries (LMXBs) with the Rossi X-ray Timing Explorer has stimulated extensive studies of these sources. Recently, Osherovich & Titarchuk suggest a new model for kHz QPOs and the related correlations between kHz QPOs and low frequency features in LMXBs. Here we use their results to study the mass - radius relation for the atoll source 4U 1728-34. We find that, if this model is correct, 4U 1728-34 is possibly a strange star rather a neutron star.

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