Query : 2001A&A...372..925B

2001A&A...372..925B - Astronomy and Astrophysics, volume 372, 925-934 (2001/6-4)

Temperature profiles of accretion discs around rapidly rotating strange stars in general relativity: A comparison with neutron stars.


Abstract (from CDS):

We compute the temperature profiles of accretion discs around rapidly rotating strange stars, using constant gravitational mass equilibrium sequences of these objects, considering the full effect of general relativity. Beyond a certain critical value of stellar angular momentum (J), we observe the radius (rorb) of the innermost stable circular orbit (ISCO) to increase with J (a property seen neither in rotating black holes nor in rotating neutron stars). The reason for this is traced to the crucial dependence of drorb/dJ on the rate of change of the radial gradient of the Keplerian angular velocity at rorb with respect to J. The structure parameters and temperature profiles obtained are compared with those of neutron stars, as an attempt to provide signatures for distinguishing between the two. We show that when the full gamut of strange star equation of state models, with varying degrees of stiffness are considered, there exists a substantial overlap in properties of both neutron stars and strange stars. However, applying accretion disc model constraints to rule out stiff strange star equation of state models, we notice that neutron stars and strange stars exclusively occupy certain parameter spaces. This result implies the possibility of distinguishing these objects from each other by sensitive observations through future X-ray detectors.

Abstract Copyright:

Journal keyword(s): dense matter - relativity - stars: neutron - accretion, accretion discs

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 810 1
2 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 964 0
3 PSR B1937+21 Psr 19 39 39.6 +21 37 22           ~ 1046 2

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