{"id":16599,"date":"2017-11-15T15:43:35","date_gmt":"2017-11-15T18:43:35","guid":{"rendered":"http:\/\/www.astrofisicamas.cl\/?p=16599"},"modified":"2023-08-04T22:55:52","modified_gmt":"2023-08-04T22:55:52","slug":"la-extincion-interestelar-que-nos-impide-ver-las-estrellas-del-centro-de-la-via-lactea","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/la-extincion-interestelar-que-nos-impide-ver-las-estrellas-del-centro-de-la-via-lactea\/","title":{"rendered":"Nuestra Investigaci\u00f3n: La extinci\u00f3n interestelar que nos impide ver las estrellas del centro de la V\u00eda L\u00e1ctea"},"content":{"rendered":"<h4><em><strong>Por Javier Alonso &#8211; Garc\u00eda, investigador joven MAS y Unidad de Astronom\u00eda Universidad de Antofagasta<\/strong><\/em><!--more--><\/h4>\n<p><strong>Como si de una espesa niebla se tratase, las nubes de polvo y gas que se encuentran entre nuestro sistema solar y el centro de nuestra galaxia obstruyen el paso de la luz de las estrellas situadas en las zonas centrales de la V\u00eda L\u00e1ctea, lo que dificulta su correcta caracterizaci\u00f3n.<\/strong><strong>&nbsp;<\/strong><\/p>\n<p><strong>Afortunadamente, los efectos de esta niebla disminuyen en gran medida en el infrarrojo. Para explotar al m\u00e1ximo este hecho, desde hace unos a\u00f1os el proyecto Vista Variables in the V\u00eda L\u00e1ctea (VVV),<\/strong> del que formo parte, est\u00e1 utilizando VISTA, el telescopio de catastros astron\u00f3micos en infrarrojo m\u00e1s avanzado del mundo. El telescopio VISTA, situado en el observatorio de Cerro Paranal, en la regi\u00f3n de Antofagasta, nos permite ver en el infrarrojo y muestrear millones de estrellas con cada observaci\u00f3n que hacemos de las regiones internas de nuestra galaxia.<\/p>\n<p>En las observaciones del VVV son numerosas las llamadas estrellas del <strong>\u201cred clump\u201d.<\/strong> <strong>Estas son estrellas evolucionadas que han agotado el hidr\u00f3geno en su zona central y producen energ\u00eda por reacciones termonucleares de helio.<\/strong> Dada su composici\u00f3n qu\u00edmica rica en metales y su distancia (aproximadamente la misma, al estar localizadas en el bulbo central de nuestra galaxia) estas estrellas se deber\u00edan agrupar en una regi\u00f3n compacta en el diagrama color-magnitud, el cual correlaciona el color y el brillo observado de las estrellas.<\/p>\n<p><strong>Pero en las regiones m\u00e1s centrales de nuestra V\u00eda L\u00e1ctea, los efectos de las nubes de gas y polvo se hacen presentes incluso a longitudes de onda infrarrojas.<\/strong> Como, adem\u00e1s, las concentraciones de gas y polvo son diferentes en distintas direcciones, las estrellas del red clump, en lugar de formar un grupo compacto, se distribuyen a lo largo de una franja que va desde estrellas poco afectadas por extinci\u00f3n a otras m\u00e1s enrojecidas en su color y m\u00e1s atenuadas en su brillo.<\/p>\n<p><strong>La gran calidad de las observaciones del VVV nos permiten observar m\u00e1s estrellas del red clump que cualquier observaci\u00f3n previa de estas regiones, <\/strong>por lo que podemos estudiar la forma en que se relaciona el enrojecimiento en distintas regiones del espectro infrarrojo con la disminuci\u00f3n de brillo con un nivel de precisi\u00f3n y detalle nunca conseguido antes. <strong>Esta relaci\u00f3n nos permiti\u00f3 una caracterizaci\u00f3n exquisita de los efectos del polvo c\u00f3smico en la zona central de nuestra Galaxia<\/strong>. Como el polvo afecta la observaci\u00f3n no s\u00f3lo las de las estrellas del red clump sino de todos los objetos que est\u00e1n en esta regi\u00f3n, <strong>nuestro trabajo ser\u00e1 fundamental para muchos otros estudios de las zonas internas de la V\u00eda L\u00e1ctea en el futuro.<\/strong><\/p>\n<p>Link relacionados:<\/p>\n<p><a href=\"http:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/aa92c3\/meta\">http:\/\/iopscience.iop.org\/article\/10.3847\/2041-8213\/aa92c3\/meta<\/a><\/p>\n<p><a href=\"http:\/\/aasnova.org\/2017\/10\/30\/featured-image-extinction-in-our-inner-galaxy\/\">http:\/\/aasnova.org\/2017\/10\/30\/featured-image-extinction-in-our-inner-galaxy\/<\/a><\/p>\n<p><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/11\/2017_11_18_Jalonso1.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-16602 size-full\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/11\/2017_11_18_Jalonso1.jpg\" alt=\"\" width=\"776\" height=\"577\"><\/a>[:]<\/p>","protected":false},"excerpt":{"rendered":"<p>Por Javier Alonso &#8211; Garc\u00eda, investigador joven MAS y Unidad de Astronom\u00eda Universidad de Antofagasta<\/p>","protected":false},"author":3,"featured_media":29211,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_eb_attr":"","footnotes":""},"categories":[59],"tags":[],"class_list":["post-16599","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columnas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nuestra Investigaci\u00f3n: La extinci\u00f3n interestelar que nos impide ver las estrellas del centro de la V\u00eda L\u00e1ctea - Instituto Milenio de Astrof\u00edsica MAS<\/title>\n<meta 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