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New pulsating db white dwarf stars from the Sloan Digital Sky Survey

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New pulsating db white dwarf stars from the Sloan Digital Sky Survey

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Título New pulsating db white dwarf stars from the Sloan Digital Sky Survey
Autor Nitta, Atsuko
Kleinman, Scot James
Krzesinski, Jerzy
Kepler, Souza Oliveira
Metcalfe, Travis S.
Mukadam, Anjum Shagufta
Mullally, Fergal
Nather, R. Edward
Sullivan, Denis J.
Thompson, S. E.
Winget, Donald Earl
Abstract We are searching for new He atmosphere white dwarf pulsators (DBVs) based on the newly found white dwarf stars from the spectra obtained by the Sloan Digital Sky Survey. DBVs pulsate at hotter temperature ranges than their better known cousins, the H atmosphere white dwarf pulsators (DAVs or ZZ Ceti stars). Since the evolution of white dwarf stars is characterized by cooling, asteroseismological studies of DBVs give us opportunities to study white dwarf structure at a different evolutionary stage than the DAVs. The hottest DBVs are thought to have neutrino luminosities exceeding their photon luminosities, a quantity measurable through asteroseismology. Therefore, they can also be used to study neutrino physics in the stellar interior. So far we have discovered nine new DBVs, doubling the number of previously known DBVs. Here we report the new pulsators’ light curves and power spectra.
Contido em The astrophysical journal. Bristol. Vol. 690, no. 1 (Jan. 2009), p. 560-565
Assunto Anãs brancas
Espectros estelares
Estrelas variaveis
Pulsacoes estelares
[en] Stars: general
[en] Stars: oscillations
[en] Stars: variables: other
[en] White dwarfs
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/108978
Arquivos Descrição Formato
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