White dwarf stars as strange quark matter detectors - III

We continue the study of the properties of non-radial pulsations of strange dwarfs. These stars are essentially white dwarfs with a strange quark matter (SQM) core. We have previously shown that the spectrum of oscillations should be formed by several, well-detached clusters of modes inside which th...

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Detalles Bibliográficos
Autor principal: Benvenuto, Omar Gustavo
Formato: Articulo
Lenguaje:Inglés
Publicado: 2006
Materias:
Ciencias Astronómicas
Dense matter
Stars: oscillations
White dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83220
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83220
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Dense matter
Stars: oscillations
White dwarfs
spellingShingle Ciencias Astronómicas
Dense matter
Stars: oscillations
White dwarfs
Benvenuto, Omar Gustavo
White dwarf stars as strange quark matter detectors - III
topic_facet Ciencias Astronómicas
Dense matter
Stars: oscillations
White dwarfs
description We continue the study of the properties of non-radial pulsations of strange dwarfs. These stars are essentially white dwarfs with a strange quark matter (SQM) core. We have previously shown that the spectrum of oscillations should be formed by several, well-detached clusters of modes inside which the modes are almost evenly spaced. Here, we study the relation between the characteristics of these clusters and the size of the SQM core. We do so assuming that, for a given cluster, the kinetic energy of the modes is constant. For a constant amplitude of the oscillation at the stellar surface, we find that the kinetic energy of the modes is very similar for the cases of models with LogQSQM = -2, -3 and -4, while it is somewhat lower for LogQSQM = -5 (here QSQM = MSQM/M; M SQM and M are the masses of the SQM core and the star, respectively). Remarkably, the shape (amplitude of the modes versus period of oscillation) of the clusters of periods is very similar. However, the number of modes inside each cluster is strongly (and non-monotonously) dependent upon the size of the SQM core. The characteristics of the spectrum of oscillations of strange dwarf stars are very different from the ones corresponding to normal white dwarfs and should be, in principle, observable. Consequently, the stars usually considered as white dwarfs may indeed provide an interesting and affordable way to detect SQM in an astrophysical environment.
format Articulo
Articulo
author Benvenuto, Omar Gustavo
author_facet Benvenuto, Omar Gustavo
author_sort Benvenuto, Omar Gustavo
title White dwarf stars as strange quark matter detectors - III
title_short White dwarf stars as strange quark matter detectors - III
title_full White dwarf stars as strange quark matter detectors - III
title_fullStr White dwarf stars as strange quark matter detectors - III
title_full_unstemmed White dwarf stars as strange quark matter detectors - III
title_sort white dwarf stars as strange quark matter detectors - iii
publishDate 2006
url http://sedici.unlp.edu.ar/handle/10915/83220
work_keys_str_mv AT benvenutoomargustavo whitedwarfstarsasstrangequarkmatterdetectorsiii
bdutipo_str Repositorios
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