{"id":71484,"date":"2018-03-09T23:16:07","date_gmt":"2018-03-09T23:16:07","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/busqueda-de-bandas-difusas-en-envolturas-circunestelares\/"},"modified":"2018-03-09T23:16:07","modified_gmt":"2018-03-09T23:16:07","slug":"busqueda-de-bandas-difusas-en-envolturas-circunestelares","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/astronomia-y-astrofisica\/busqueda-de-bandas-difusas-en-envolturas-circunestelares\/","title":{"rendered":"B\u00fasqueda de bandas difusas en envolturas circunestelares."},"content":{"rendered":"<h2>Tesis doctoral de <strong> Ramon Luna Molina <\/strong><\/h2>\n<p>En este tesis presentamos los resultados preliminares de un estudio consistente en la b\u00fasqueda sistem\u00e1tica de 9 de las bandas difusas (dbs en adelante), m\u00e1s intensas y mejor conocidas normalmete encontradas en el medio interestelar (de aqu\u00ed el nombre de bandas difusas interestelares o dibs), en las direcciones de observaci\u00f3n correspondiente a una muestra de 33 estrellas post-agb cuidadosamente seleccionadas. El objetivo es determinar si (algunas de) las especies responsables de estas dbs podr\u00edan estar presentes en sus envolturas circunestelares y ser las responsables de las dbs detectadads en sus espectros \u00f3pticos de alta resoluci\u00f3n.  hemos encontrado que las estrellas post-agb con las mayores contribuciones circunestelares a la extinci\u00f3n observada presentan sistem\u00e1ticamente un d\u00e9ficit considerable en la intensidad de las dbs detectadas. Este d\u00e9ficit es independiente de la qu\u00edmica dominante en la envoltura circunesterar y dela temperatura efectiva de las estrellas post-agb consideradas y ser\u00eda compatible con la ausencia total de las especies responsables de las dbs en sus envolturas. S\u00f3lo en el caso de estrellas post-agb ricas en carbono de tipos espectrales tempranos, encontramos evidencias que nos permiten sugerir que estas especies podr\u00edan comenzar a ser formadas in situ en este tipo de estrellas, al fianl de la fase post-agb. Ello ser\u00eda consecuencia fundamentalmente de la creciente irradiaci\u00f3n uv procedente de la estrella central que est\u00e1 sufriendo una r\u00e1pida evoluci\u00f3n.  proponemos que las especies responsables de las dbs ser\u00edan por tanto especies carbon\u00e1ceas, probablemente radicales unidos a grandes mol\u00e9culas o atrapados en estructuras m\u00e1s complejas, o algunos de los constituyentes de los mantos que cubren los granos de polvo circunesterales, que ser\u00edan liberados al final de la fase post-agb como consecuencia del bombardeo creciente de fotones uv procedentes de la estrella central o posteriormente como res<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>B\u00fasqueda de bandas difusas en envolturas circunestelares.<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 B\u00fasqueda de bandas difusas en envolturas circunestelares. <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Ramon Luna Molina <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Valencia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 26\/11\/2004<\/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>Pedro Garcia Lario<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: jose Cernicharo quintanilla <\/li>\n<li>guillermo Bernabeu pastor (vocal)<\/li>\n<li> Van winckel  hans Mar\u00eda  j (vocal)<\/li>\n<li>susana Iglesias groth (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Ramon Luna Molina En este tesis presentamos los resultados preliminares de un estudio consistente en la b\u00fasqueda [&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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