Limits to the mass and the radius of the compact star in SAX J1808.4-3658 and their implications

Bhattacharyya, Sudip (2001) Limits to the mass and the radius of the compact star in SAX J1808.4-3658 and their implications. In: Astrophysical Journal, 554 (2, Par). L185-L188.

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Abstract

We show that a survey of equations of state and bservations of X-ray pulsations from SAX J1808.4-3658 give 2.27 M-. as the upper limit of the compact star mass. The corresponding upper limit of the radius comes out to be 9.73 km. We also do a probabilistic study to estimate the lower limit of the mass of the compact star. Such a limit puts useful constraints on equations of state. We also discuss the implications of the upper mass limit for the evolutionary history of the source, as well as the detection of it in radio frequencies. We envisage that the possible observation of radio eclipse may be able to rule out several soft equation-of-state models, by setting a moderately high value for the lower limit of the inclination angle.

Item Type:	Journal Article
Publication:	Astrophysical Journal
Publisher:	University of Chicago Press
Additional Information:	Copyright of this article belongs to University of Chicago Press.
Keywords:	accretion, accretion disks;binaries :close;equation of state;pulsars :individual (SAX J1808.4-3658);X-rays :stars.
Department/Centre:	Division of Physical & Mathematical Sciences > Astronomy and Astrophysics Programme
Date Deposited:	04 Sep 2009 03:09
Last Modified:	19 Sep 2010 04:55
URI:	http://eprints.iisc.ac.in/id/eprint/17112

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