{"id":81112,"date":"1999-04-11T00:00:00","date_gmt":"1999-04-11T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/stellar-populations-in-the-local-group-dwarf-galaxies-ngc-185-and-phoenix\/"},"modified":"1999-04-11T00:00:00","modified_gmt":"1999-04-11T00:00:00","slug":"stellar-populations-in-the-local-group-dwarf-galaxies-ngc-185-and-phoenix","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/astronomia-y-astrofisica\/stellar-populations-in-the-local-group-dwarf-galaxies-ngc-185-and-phoenix\/","title":{"rendered":"Stellar populations in the local group dwarf galaxies ngc 185 and phoenix"},"content":{"rendered":"<h2>Tesis doctoral de <strong> David Martinez Delgado <\/strong><\/h2>\n<p>En esta tesis la poblaci\u00f3n estelar de las galaxias enanas del grupo local ngc 185 y phoenix es investigada a partir de fotometr\u00eda obtenida en telescopios en tierra y usando diagramas color-magnitud sint\u00e9ticos. El principal resultado de esta tesis es que ambas galaxias presentan periodos largos de actividad de formaci\u00f3n estelar y gradientes en sus poblaciones estelares, lo que proporcionan nuevos indicios acerca de la formaci\u00f3n y evoluci\u00f3n de las galaxias enanas en general. Entre los resultados m\u00e1s interesantes se obtiene que la galaxia el\u00edptica enana ngc 185 esta compuesta por una mezcla de estrellas viejas, de edad intermedia y j\u00f3venes, y por tanto, no ajusta el concepto cl\u00e1sico de \u00absistema de poblaci\u00f3n-ii puro\u00bb atribuido hist\u00f3ricamente a estas galaxias hasta hace pocos a\u00f1os. In phoenix, una galaxia intermedia entre irregular y esferoidal, se encuentra evidencias de esta galaxia podria haber expulsado todo su gas tras un episodio de formaci\u00f3n estelar hace 100 myr, proporcionando nuevas pistas acerca de la relaci\u00f3n evolutiva entre estos dos tipos de galaxias. Otro resultado muy importante es el hallazgo de una poblaci\u00f3n subyacente en phoenix distribuida en una componente esferoidal externa similar a los halos de las galaxias espirales. Este resultado es consistente con la hip\u00f3tesis de que estas galaxias son los objetos \u00abprimeval\u00bb del universo, tal como predicen los escenarios modernos de formaci\u00f3n jerarquizada de galaxias.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Stellar populations in the local group dwarf galaxies ngc 185 and phoenix<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Stellar populations in the local group dwarf galaxies ngc 185 and phoenix <\/li>\n<li><strong>Autor:<\/strong>\u00a0 David Martinez Delgado <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 La laguna<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 04\/11\/1999<\/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>Antonio Aparicio Juan<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Francisco Sanchez Martinez <\/li>\n<li>Javier Gorgas garcia (vocal)<\/li>\n<li>Emilio Alfaro navarro (vocal)<\/li>\n<li>marc Balcells com\u00e1s (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de David Martinez Delgado En esta tesis la poblaci\u00f3n estelar de las galaxias enanas del grupo local ngc [&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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