DSpace
 

RRI Digital Repository >
04. Astronomy and Astrophysics >
Research Papers (A&A) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1616

Title: Possible signatures for strange stars in stellar X-ray binaries
Authors: Datta, Bhaskar
Thampan, Arun V.
Bombaci, I.
Keywords: ACCRETION
ACCRETION DISKS
DENSE MATTER
EQUATION OF STATE
STARS: BINARIES: CLOSE
STARS: NEUTRON
X-RAYS: BURSTS
Issue Date: Mar-2000
Publisher: Springer-Verlag
Citation: Astronomy and Astrophysics, 2000, Vol.355, pL19-L22
Abstract: Kilohertz quasi-periodic brightness oscillations (kHz QPOs) observed in certain X-ray burst sources may represent Keplerian frequencies in the inner regions of the accretion disk in such systems. If this assumption is strictly adhered to, we show here that if the central accretor in stellar X-ray burst sources is a strange star (made up of u, d and s quarks in beta equilibrium, referred to as strange matter) then the calculated QPO frequencies are reconcilable with the observed QPO frequencies (corresponding to the highest frequency of 1.22 kHz, observed so far from the source 4U 1636-53) only for particular values of the QCD-related parameters which describe the equation of state of strange matter. We demonstrate that QPO frequencies in the very high range (1.9-3.1) kHz can be understood in terms of a (non-magnetized) strange star X-ray binary (SSXB) rather than a neutron star X-ray binary (NSXB). Future discovery of such high frequency QPOs from X-ray burst sources will constitute a new astrophysical diagnostic for identifying solar mass range stable strange stars in our galaxy.
URI: http://hdl.handle.net/2289/1616
ISSN: 0004-6361
Alternative Location: http://arxiv.org/abs/astro-ph/9912173
http://adsabs.harvard.edu/cgi-bin/bib_query?2000A&A...355L..19D
Copyright: (2000) by the European Southern Observatory
Appears in Collections:Research Papers (A&A)

Files in This Item:

File Description SizeFormat
2000 A&A.355.PL19.pdf4p.159.08 kBAdobe PDFView/Open

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

    RRI Library DSpace