NDLI: Estimate of stellar masses from their QPO frequencies

Content Provider	Springer Nature Link
Author	RAY, SUBHARTHI GANGOPADHYAY, TAPARATI DEY, JISHNU DEY, MIRA
Copyright Year	2011
Abstract	Kilohertz quasiperiodic oscillations (kHz QPOs) are observed in binary stellar systems. For such a system, the stellar radius is very close to the marginally stable orbit R $_{ms}$ as predicted by Einstein’s general relativity. Many models have been proposed to explain the origin of the kHz QPO features in the binaries. Here we start from the work of Li et al (Phys. Rev . Lett. 83, 3776 (1999)) who in 1999, from the unique millisecond X-ray pulsations, suggested SAX J1808.4−3658 to be a strange star, from an accurate determination of its rotation period. It showed kHz QPOs eight years ago and so far it is the only set that has been observed. 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 kHz QPOs of these stars. It is exciting to be able to give an estimate of the mass of the star and three other compact stars in low-mass X-ray binaries using their observed kHz QPOs.
Starting Page	571
Ending Page	579
Page Count	9
File Format	PDF
ISSN	03044289
Journal	Pramana
Volume Number	77
Issue Number	3
e-ISSN	09737111
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-08-26
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Khz QPOs strange stars Astrophysics and Astroparticles Physics Astronomy, Observations and Techniques
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy

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