Apparent radii of neutron stars and equation of state of dense matter
arXiv:astro-ph/0105485 · doi:10.1051/0004-6361:20011358
Abstract
Apparent (radiation) radius of neutron star,R_\infty, depends on the star gravitational mass in quite a different way than the standard coordinate radius in the Schwarzschild metric, R. We show that, for a broad set of equations of state of dense matter, R_\infty(M_max) for the configurations with maximum allowable masses is very close to the absolute lower bound on R_\infty at fixed M, resulting from the very definition of R_\infty. Also, the value of R_infty at given M, corresponding to the maximum compactness (minimum R) of neutron star consistent with general relativity and condition v_sound<c, is only 0.6% higher than this absolute lower bound. Theoretical predictions for R_\infty are compared with existing observational estimates of the apparent radii of neutron stars.
4 pages, 2 figures, latex, uses aa.cls, to be published in Astronomy and Astrophysics
References in corpus (2)
Cited by in corpus (19)
- A unified equation of state of dense matter and neutron star structure
- Strange Quark Matter and Compact Stars
- New Constraints on Neutron Star Cooling from Chandra Observations of 3C58
- Constraining the Radii of Neutron Stars with Terrestrial Nuclear Laboratory Data
- Bare Quark Stars or Naked Neutron Stars ? The Case of RX J1856.5-3754
- The Parallax and Proper Motion of RX J1856.5-3754 Revisited
- Comment on "Multiscatter stellar capture of dark matter"
- X-ray spectroscopy of PSR B1951+32 and its pulsar wind nebula
- The cluster structure of the inner crust of neutron stars in the Hartree-Fock-Bogoliubov approach
- The optical/UV excess of X-ray dim isolated neutron star: I. bremsstrahlung emission from a strangeon star plasma atmosphere
- Burst-properties as a function of mass accretion rate in GX 3+1
- Measuring Neutron Star Mass and Radius with Three Mass-Radius Relations
- What can the redshift observed in EXO 0748-676 tell us?
- Effects of a weakly interacting light U boson on the nuclear equation of state and properties of neutron stars in relativistic models
- On the minimum radius of strange stars with crust
- Symmetry energy and neutron star properties in the saturated Nambu-Jona-Lasinio model
- Small radii of neutron stars as an indication of novel in-medium effects
- Does Sub-millisecond Pulsar XTE J1739-285 Contain a Low Magnetic Neutron Star or Quark Star ?
- Equation of state and hybrid star properties with the weakly interacting light U-boson in relativistic models