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

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

1999-08-25

arxiv.org/abs/astro-ph/9908274v1

Astrophys.J. 527 (1999) L51-L54

Astronomy and Astrophysics

Astrophysics

7 pages, 1 figure

Scientific paper

10.1086/312394

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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