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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
KHz QPOs in LMXBs, relations between different frequencies and compactness of stars
New Astronomy, Volume 17, No. 1, Year 2012
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Description
We suggest that the mass of four compact stars SAX J1808.4-3658, KS 1731-260, SAX J1750.8-2900 and IGR J17191-2821 can be determined from the difference in the observed kiloHertz quasi periodic oscillations (kHz QPO-s) of these stars. The stellar radius is very close to the marginally stable orbit Rms as predicted by Einstein's general relativity. It may be noted that the first of these stars was suggested to be a strange star more than a decade back by Li et al. (1999a) from the unique millisecond X-ray pulsations with an accurate determination of its rotation period. It showed kHz QPO-s eight years back and so far it is the only set that has been observed. This is the first time we give an estimate of the mass of the star and of three other compact stars in low-mass X-ray binaries using their observed kHz QPO-s. © 2011 Elsevier B.V. All rights reserved.
Authors & Co-Authors
Gangopadhyay, Taparati
India, Kolkata
Presidency University, Kolkata
Li, Xiangdong
China, Nanjing
Nanjing University
Ray, Subharthi
South Africa, Durban
University of Kwazulu-natal
Dey, Mira
India, Kolkata
Presidency University, Kolkata
Dey, Jishnu
India, Kolkata
Presidency University, Kolkata
Statistics
Citations: 5
Authors: 5
Affiliations: 3
Identifiers
Doi:
10.1016/j.newast.2011.02.002
ISSN:
13841076