EDP Sciences
Free access
Issue
A&A
Volume 405, Number 2, July II 2003
Page(s) 747 - 751
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030642


A&A 405, 747-751 (2003)
DOI: 10.1051/0004-6361:20030642

Accelerated expansion of the Crab Nebula and evaluation of its neutron-star parameters

M. Bejger and P. Haensel

N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warszawa, Poland
    e-mail: bejger@camk.edu.pl;haensel@camk.edu.pl
(Received 30 January 2003 / Accepted 16 April 2003 )

Abstract
A model of an accelerated expansion of the Crab Nebula powered by the spinning-down Crab pulsar is proposed, in which time dependence of the acceleration is connected to the evolution of pulsar luminosity. Using recent observational data, we derive estimates of the Crab neutron-star moment of inertia. Correlations between the neutron star moment of inertia and its mass and radius allow for rough estimates of the Crab neutron-star radius and mass. In contrast to the previously used constant-acceleration approximation, even for the expanding nebula mass of ~ $7~M_{\odot}$ the results obtained within our model are not in conflict with the modern stiff equations of state of dense matter.


Key words: stars: neutron -- stars: pulsars: individual: Crab -- ISM: supernova remnants

Offprint request: M. Bejger, bejger@camk.edu.pl

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