{"id":15692,"date":"2017-05-17T09:11:53","date_gmt":"2017-05-17T13:11:53","guid":{"rendered":"http:\/\/www.astrofisicamas.cl\/?p=15692"},"modified":"2023-08-07T20:56:21","modified_gmt":"2023-08-07T20:56:21","slug":"nuestra-investigacion-estrellas-variables-en-el-centro-de-la-via-lactea","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/nuestra-investigacion-estrellas-variables-en-el-centro-de-la-via-lactea\/","title":{"rendered":"Nuestra investigaci\u00f3n: Estrellas Variables en el centro de la V\u00eda L\u00e1ctea"},"content":{"rendered":"<h4><strong><em>Por Claudio Navarro, estudiante de doctorado MAS y del Instituto de F\u00edsica y Astronom\u00eda UV<\/em><\/strong><!--more--><\/h4>\n<p><strong>El centro de nuestra Galaxia, la V\u00eda L\u00e1ctea, es un lugar fascinante.<\/strong> Ubicado a unos 26 mil a\u00f1os luz de nosotros, se caracteriza por tener una gran cantidad de estrellas de diferentes edades, todas muy cercanas entre s\u00ed. Adem\u00e1s, alberga un gigantesco agujero negro -conocido como Sagittarius A*- con una masa equivalente a millones de veces la masa de nuestro Sol. Estas caracter\u00edsticas convierten al centro Gal\u00e1ctico en un laboratorio excepcional para poner a prueba los modelos de formaci\u00f3n y evoluci\u00f3n estelar en un ambiente a la vez denso y ca\u00f3tico.<\/p>\n<p>Dentro de esta regi\u00f3n encontramos tambi\u00e9n a dos c\u00famulos estelares muy j\u00f3venes y sorprendentemente masivos: Arches y Quintuplet, con masas del orden de 10.000 veces la masa del Sol, y cuyas edades son menores a 5 millones de a\u00f1os.<\/p>\n<p>Entre el centro Gal\u00e1ctico y nosotros hay una gran cantidad de polvo interestelar que absorbe la luz con mucha eficiencia y torna casi imposible ver las estrellas de esta zona en longitudes de onda visibles. Es necesario observar en el Infrarrojo, que es afectado en menor grado. Para esto utilizamos las im\u00e1genes del proyecto <strong>VISTA Variables in the V\u00eda L\u00e1ctea (VVV), el cual ha realizado m\u00e1s de un centenar de observaciones infrarrojas tanto del bulbo como del disco de nuestra Galaxia, desde el a\u00f1o 2010.<\/strong><\/p>\n<p>En nuestro trabajo, cuyos detalles se pueden encontrar en este <a href=\"https:\/\/arxiv.org\/abs\/1607.01795\">link<\/a>, nos enfocamos en una peque\u00f1a regi\u00f3n del cielo, alrededor del c\u00famulo llamado Quintuplet, cuyo nombre se debe a la notoria presencia de 5 estrellas muy brillantes -entre ellas la \u201cestrella Pistola\u201d, la m\u00e1s brillante de la V\u00eda L\u00e1ctea. <strong>Nuestro objetivo era hacer un censo de las estrellas variables asociadas con este c\u00famulo. Dado que el c\u00famulo es bastante joven, esper\u00e1bamos la presencia numerosa de estrellas en proceso de formaci\u00f3n<\/strong> (conocidas como YSOs, que es la sigla en ingl\u00e9s de \u201cyoung stellar objects\u201d). Estos objetos en general presentan cambios significativos de brillo, debidos principalmente a la acreci\u00f3n de material desde el disco que rodea a la protoestrella.<\/p>\n<p style=\"text-align: left;\"><strong>Como resultado, encontramos 33 estrellas variables, de las cuales 24 no hab\u00edan sido estudiadas en trabajos anteriores.<\/strong> La mayor parte de estas estrellas se encuentran en la Rama Asint\u00f3tica, es decir, son estrellas gigantes rojas de masa intermedia, las cuales est\u00e1n en una etapa muy avanzada de su evoluci\u00f3n. Adem\u00e1s, encontramos cuatro variables que parecen ser objetos estelares j\u00f3venes, las cuales podr\u00edan pertenecer a Quintuplet, aunque se requieren otros estudios para confirmar o descartar esta posibilidad. Una de las conclusiones de este trabajo es que detectamos una menor cantidad de estrellas j\u00f3venes que la esperada. Las implicancias de este resultado est\u00e1n siendo analizadas actualmente.<\/p>\n<figure id=\"attachment_15712\" aria-describedby=\"caption-attachment-15712\" style=\"width: 602px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/05\/2017_05_17_cnavarro-2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15712 size-full\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/05\/2017_05_17_cnavarro-2.jpg\" alt=\"\" width=\"602\" height=\"535\" \/><\/a><figcaption id=\"caption-attachment-15712\" class=\"wp-caption-text\">Los c\u00edrculos rojos muestran la localizaci\u00f3n de las 33 estrellas variables encontradas. En el centro de la imagen se observa el c\u00famulo Quintuplet.<\/figcaption><\/figure>","protected":false},"excerpt":{"rendered":"<p>Por Claudio Navarro, estudiante de doctorado MAS y del Instituto de F\u00edsica y Astronom\u00eda UV<\/p>","protected":false},"author":3,"featured_media":29277,"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-15692","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: Estrellas Variables en el centro de la V\u00eda L\u00e1ctea - Instituto Milenio de Astrof\u00edsica MAS<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/astrofisicamas.cl\/en\/nuestra-investigacion-estrellas-variables-en-el-centro-de-la-via-lactea\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nuestra investigaci\u00f3n: Estrellas Variables en el centro de la V\u00eda L\u00e1ctea - 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