Volume 105, Number 3, February 2014
|Number of page(s)||6|
|Section||Geophysics, Astronomy and Astrophysics|
|Published online||18 February 2014|
Radial oscillations of neutral and charged hybrid stars
1 Frankfurt Institute for Advanced Studies (FIAS) - Ruth-Moufang-Straße 1, 60438 Frankfurt am Main, Germany
2 Institut für Theoretische Physik, Johann Wolfgang Goethe - Universität - Max-von-Laue-Straße 1, 60438 Frankfurt am Main, Germany
3 Kurchatov Institute, Russian Research Center - Akademika Kurchatova 1, 123182 Moscow, Russia
Received: 23 October 2013
Accepted: 22 January 2014
We construct stellar models of hadron stars and hybrid stars and calculate the frequencies of their lowest radial mode of vibration. Chandrasekhar's equation for radial oscillations is generalized for stars with internal electric fields and earlier versions of that generalization are simplified. For the hybrid stars a Gibbs construction is employed. It is found that the softening of the equation of state associated with the presence of deconfined quarks reduces the oscillation frequency. We show that a slight charge inbalance should lead to increased maximum mass, decreased central density and lower oscillation frequencies.
PACS: 97.60.Jd – Neutron stars / 95.30.Sf – Relativity and gravitation / 26.60.Kp – Equations of state of neutron-star matter
© EPLA, 2014
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