| Issue |
A&A
Volume 405, Number 2, July II 2003
|
|
|---|---|---|
| Page(s) | 747 - 751 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20030642 | |
| Published online | 19 June 2003 | |
Accelerated expansion of the Crab Nebula and evaluation of its neutron-star parameters
N. Copernicus Astronomical Center, Polish Academy of Sciences, Bartycka 18, 00-716 Warszawa, Poland e-mail: bejger@camk.edu.pl;haensel@camk.edu.pl
Corresponding author: M. Bejger, bejger@camk.edu.pl
Received:
30
January
2003
Accepted:
16
April
2003
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 ~
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
© ESO, 2003
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