{"id":57370,"date":"2007-05-03T00:00:00","date_gmt":"2007-05-03T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/an-observational-and-theoreticas-study-of-the-potential-instability-of-o-type-hor-subdwarf-stars\/"},"modified":"2007-05-03T00:00:00","modified_gmt":"2007-05-03T00:00:00","slug":"an-observational-and-theoreticas-study-of-the-potential-instability-of-o-type-hor-subdwarf-stars","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/estrellas-variables\/an-observational-and-theoreticas-study-of-the-potential-instability-of-o-type-hor-subdwarf-stars\/","title":{"rendered":"An observational and theoreticas study of the potential instability of o-type hor subdwarf stars"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Cristina Teresa Rodriguez Lopez <\/strong><\/h2>\n<p>Las estrellas subenanas calientes de tipo o, tambi\u00e9n llamadas estrellas sdo, son objetos azules subluminosos considerados la conexi\u00f3n evolutiva entre las etapas de rama asint\u00f3tica de gigantes y rama horizontal extendida, con la fase de enana blanca, el \u00faltimo estado en la evoluci\u00f3n de una estrella de baja masa. dado que a\u00fan persisten grandes inc\u00f3gnitas sobre sus or\u00edgenes y destino, estos podr\u00edan ser esclarecidos si las sdos fuesen estrellas pulsantes. La propagaci\u00f3n de ondas en el interior estelar puede provocar cambios en la temperatura superficial, que se traducen en cambios peri\u00f3dicos en el brillo de la estrella. Ya que los modos de oscilaci\u00f3n est\u00e1n \u00edntimamente relaciones con la estructura interna, se podr\u00eda conocer la distribuci\u00f3n de los par\u00e1metros f\u00edsicos en el interior de la estrella y as\u00ed poner a prueba las teor\u00edas de evoluci\u00f3n estelar. teniendo en cuenta el descubrimiento previo de oscilaciones en objetos relacionados evolutivamente, como las subenanas calientes de tipo b (sdb) y las estrellas gw virgins, nuestro objetivo fue la b\u00fasqueda de pulsaciones en estrellas sdo desde un punto de vista observacional te\u00f3rico. as\u00ed, realizamos una b\u00fasqueda fotom\u00e9trica de sdos pulsantes usando fotometr\u00eda r\u00e1pida ccd en estrellas de los hemisferios norte y sur. Se observaron un total de 56 sdis, cuyo resultado fue el descubriendo de dos candidatas pulsantes muy probables. desde el punto de vista te\u00f3rico, exploramos la posibilidad de excitar pulsaciones en modelos de equilibrio te\u00f3ricos de sdos. La estabilidad de los modelos se determin\u00f3 con un c\u00f3digo no adiab\u00e1tico de oscilaciones. Analizamos 27 modelos de equilibrio de sdos pertenecientes a 16 secuencias evolutivas diferentes, y descubrimos el primer modelo de equilibrio de una sdo capaz de excitar modos-g de alto orden radial debido a la presencia de un cl\u00e1sico mecanismo-kappa causado por las zonas de ionizaci\u00f3n parcial de elementos pesados o del c\/o en la envoltura de la estrella.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>An observational and theoreticas study of the potential instability of o-type hor subdwarf stars<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 An observational and theoreticas study of the potential instability of o-type hor subdwarf stars <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Cristina Teresa Rodriguez Lopez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Vigo<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 05\/03\/2007<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Ana Mar\u00eda Ulla Miguel<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: minia Manteiga outeiro <\/li>\n<li>stephane Charpinet (vocal)<\/li>\n<li>Andr\u00e9s Moya bedon (vocal)<\/li>\n<li>benjam\u00edn Montesinos comino (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Cristina Teresa Rodriguez Lopez Las estrellas subenanas calientes de tipo o, tambi\u00e9n llamadas estrellas sdo, son objetos [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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