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 suggested 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 fmd that, if this model is correct, 4U 1728-34 is possibly a strange star rather than a neutron star.
|Autori:||LI X.-D; RAY S; DEY J; DEY M; BOMBACI I|
|Titolo:||On the nature of the compact star in 4u 1728 -34|
|Anno del prodotto:||1999|
|Digital Object Identifier (DOI):||10.1086/312394|
|Appare nelle tipologie:||1.1 Articolo in rivista|