On the possibility of using seismic probes to study the core composition in pulsating white dwarfs

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Faria, JP (Autor) FCUP; Monteiro, MJPFG (Autor) FCUP

Revista

Título: Astronomische Nachrichten

Vol. 333

Páginas: 954-957

ISSN: 0004-6337

Editora: Wiley-Blackwell

Indexação

ISI Web of Knowledge - 0 Citações

Scopus - 0 Citações

Classificação Científica

FOS: Ciências exactas e naturais > Física

CORDIS: Ciências Físicas > Astronomia

Outras Informações

ID Authenticus: P-002-2PW

DOI: 10.1002/asna.201211830

Abstract (EN): White dwarfs correspond to the final stages of stellar evolution of solar-type stars. In these objects, production of energy by nuclear burning has ended which means that a white dwarf simply cools down over the course of the next billion years. It is now known that white dwarfs spend some of their cooling history in an instability strip. The pulsating white dwarfs with an hydrogen atmosphere (called DAV or ZZ Ceti stars) show non-radial oscillation modes with periods in the range 1001200 s. In this work we try to illustrate how the oscillation p-mode frequencies of idealized white dwarf models change as the result of a different chemical composition in the core, with the ultimate goal of determining the chemical stratification from seismic observations. The presence of acoustic glitches in the internal structure results in a periodic signal in the frequencies. We find that this signal depends on the chemical stratification/composition of the core in a form that can be analytically modelled ((c) 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Idioma: Inglês

Tipo (Avaliação Docente): Científica