{"id":145160,"date":"1993-01-01T00:00:00","date_gmt":"1993-01-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/materia-circunestelar-asociada-a-estrellas-variables-de-largo-periodo\/"},"modified":"1993-01-01T00:00:00","modified_gmt":"1993-01-01T00:00:00","slug":"materia-circunestelar-asociada-a-estrellas-variables-de-largo-periodo","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/astronomia-y-astrofisica\/materia-circunestelar-asociada-a-estrellas-variables-de-largo-periodo\/","title":{"rendered":"Materia circunestelar asociada a estrellas variables de largo periodo."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Javier Alcolea Jimenez <\/strong><\/h2>\n<p>En esta tesis doctoral se describen estudios realizados sobre diversos aspectos de las envolturas circunestelares que rodean a un determinado tipo de estrellas denominadas variables de largo periodo. Estos objetos son estrellas muy evolucionadas, situadas en la rama asintotica de las gigantes. Las copiosas perdidas de material que estos objetos sufren dan lugar a que se rodeen de nubes mas o menos esfericas compuestas fundamentalmente por gas molecular y particulas de polvo, denominadas envolturas circunestelares. En particular se han estudiado las emisiones de tipo maser producidas por la molecula de sio, investigandose las propiedades de este tipo de radiaciones: su variabilidad, la intensidad de las distintas lineas consideradas y su relacion con otros parametros estelares. Esto ha permitido determinar las zonas de las envolturas donde estos maseres se originan, asi como las condiciones fisicas alli reinantes. De otra parte, tambien se han tratado las envolturas circunestelares de las estrellas conocidas como variables de tipo rv tauri. Este estudio, ademas de caracterizar dichas envolturas, ha permitido tambien determinar el estado evolutivo de estos objetos en el contexto de la evolucion pos-rama asintotica de las gigantes de estrellas de baja masa.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Materia circunestelar asociada a estrellas variables de largo periodo.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Materia circunestelar asociada a estrellas variables de largo periodo. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Javier Alcolea Jimenez <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Aut\u00f3noma de Madrid<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1993<\/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>Valentin Bujarrabal Fernandez<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Jes\u00fas Gomez Gonzalez <\/li>\n<li>Alain Baudry (vocal)<\/li>\n<li>Francisco Sanchez Martinez (vocal)<\/li>\n<li>Ram\u00f3n Canal Masgoret (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Javier Alcolea Jimenez En esta tesis doctoral se describen estudios realizados sobre diversos aspectos de las envolturas [&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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