Oscillation modes of strange quark stars with a strangelet crust

5th Compact Stars in the QCD Phase Diagram

Asbell, Jessica^1 ; Jaikumar, Prashanth^1

Department of Physics and Astronomy, California State University Long Beach, 1250 Bellflower Blvd., Long Beach

CA

90840, United States^1

关键词: Cowling approximation;    Equation of state;    High frequency HF;    Mode frequencies;    Newtonian gravity;    Oscillation mode;    Radial oscillation;    Spheroidal modes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/861/1/012029/pdf
DOI  :  10.1088/1742-6596/861/1/012029

来源: IOP

【 摘 要 】

We study the non-radial oscillation modes of strange quark stars with a homogeneous core and a crust made of strangelets. Using a 2-component equation-of-state model (core+crust) for strange quark stars that can produce stars as heavy as 2 solar masses, we identify the high-frequency l=2 spheroidal (f, p) in Newtonian gravity, using the Cowling approximation. The results are compared to the case of homogeneous compact stars such as polytropic neutron stars, as well as bare strange stars. We find that the strangelet crust only increases very slightly the frequency of the spheroidal modes, and that Newtonian gravity overestimates the mode frequencies of the strange star, as is the case for neutron stars.