{"id":15960,"date":"2017-07-12T11:04:07","date_gmt":"2017-07-12T15:04:07","guid":{"rendered":"http:\/\/www.astrofisicamas.cl\/?p=15960"},"modified":"2023-08-07T18:33:34","modified_gmt":"2023-08-07T18:33:34","slug":"nuestra-investigacion-binarias-eclipsantes-que-ayudan-a-calibrar-una-regla-cosmica-universal","status":"publish","type":"post","link":"https:\/\/astrofisicamas.cl\/en\/nuestra-investigacion-binarias-eclipsantes-que-ayudan-a-calibrar-una-regla-cosmica-universal\/","title":{"rendered":"Nuestra Investigaci\u00f3n: Binarias eclipsantes que ayudan a calibrar una regla c\u00f3smica universal"},"content":{"rendered":"<h4><em><strong>Por Dariusz Graczyk, investigador postdoctoral Instituto Milenio de Astrof\u00edsica MAS<\/strong><\/em><\/h4>\n<p><!--more--><\/p>\n<p>Se han desarrollado muchos m\u00e9todos con el fin de medir grandes distancias a los distintos objetos del universo. Los mejores se basan en geometr\u00eda, y uno de ellos es el m\u00e9todo de paralaje trigonom\u00e9trico que se utiliza para medir distancias a objetos relativamente cercanos (como estrellas y m\u00e1seres) en nuestra galaxia. <strong>Pero si nuestro objetivo es medir distancias precisas fuera de la V\u00eda L\u00e1ctea, necesitaremos utilizar m\u00e9todos que combinen la geometr\u00eda con informaci\u00f3n sobre el brillo intr\u00ednseco de un objeto en particular.<\/strong><\/p>\n<p><strong>Un m\u00e9todo muy preciso utiliza una regla universal definida por el brillo superficial de las estrellas.<\/strong> Su calibraci\u00f3n proviene de observaciones interferom\u00e9tricas de estrellas cercanas. Se mide el di\u00e1metro angular de las estrellas utilizando interferometr\u00eda \u00f3ptica o infrarroja y luego se combina esta informaci\u00f3n con el brillo aparente que se mide de esta estrella en la Tierra. Como resultado se obtiene una cantidad que indica qu\u00e9 tan brillante es la superficie visible de la estrella. Esta cantidad es brillo superficial. Generalmente, se expresa en t\u00e9rminos del color de la estrella: cuanto m\u00e1s roja sea ser\u00e1 m\u00e1s fr\u00eda, y su brillo superficial ser\u00e1 m\u00e1s bajo. Por otro lado, cuanto m\u00e1s azul sea ser\u00e1 m\u00e1s caliente, y su brillo superficial ser\u00e1 m\u00e1s alto.<\/p>\n<p><strong>Hasta ahora, esta regla hab\u00eda sido calibrada s\u00f3lo con mediciones interferom\u00e9tricas. Sin embargo, en nuestro estudio (<a href=\"http:\/\/ads.astro.puc.cl\/abs\/2017ApJ...837....7G\" target=\"_blank\" rel=\"noopener\">http:\/\/ads.astro.puc.cl\/abs\/2017ApJ&#8230;837&#8230;.7G<\/a>)\u00a0<\/strong><strong>\u00a0presentamos otra alternativa de calibraci\u00f3n, que se basa en estrellas binarias eclipsantes<\/strong>. Nuestra t\u00e9cnica es completamente compatible con el antiguo m\u00e9todo de interferometr\u00eda y tiene, por lo menos, la misma precisi\u00f3n. <strong>En el trabajo seleccionamos 35 binarias eclipsantes separadas (no interactuantes) cuyos par\u00e1metros f\u00edsicos hubieran sido medidos con alta precisi\u00f3n<\/strong>. Los di\u00e1metros angulares fueron calculados a partir de los radios f\u00edsicos de ambos componentes, obtenidos del an\u00e1lisis de los eclipses, y la distancia geom\u00e9trica al par es la medida por la misi\u00f3n espacial Gaia.<\/p>\n<p>La t\u00e9cnica basada en binarias eclipsantes posee una gran ventaja: al utilizar diferentes tipos de verificaciones internas permite una validaci\u00f3n intr\u00ednseca del m\u00e9todo. Gracias a esta posibilidad pudimos validar los datos del \u201cRelease 1\u201d de Gaia (DR1), y concluir que en promedio las distancias de Gaia son sistem\u00e1ticamente un 2% mayores de lo que deber\u00edan. Dado que el DR1 entrega distancias preliminares, esperamos que este error sistem\u00e1tico sea corregido en el DR1 definitivo.<\/p>\n<figure id=\"attachment_15962\" aria-describedby=\"caption-attachment-15962\" style=\"width: 531px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/07\/2017_07_12_DGraczyk_2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-15962 size-full\" src=\"http:\/\/www.astrofisicamas.cl\/wp-content\/uploads\/2017\/07\/2017_07_12_DGraczyk_2.jpg\" alt=\"\" width=\"531\" height=\"401\" \/><\/a><figcaption id=\"caption-attachment-15962\" class=\"wp-caption-text\">Descripci\u00f3n de la imagen: El brillo superficial (ordenadas) como una funci\u00f3n del color (abscisas) obtenido a partir de los componentes de 14 binarias eclipsantes con distancias trigonom\u00e9tricas muy precisas. Se las compara con cuatro calibraciones obtenidas a partir de mediciones interferom\u00e9tricas (l\u00edneas de color). La concordancia entre los dos m\u00e9todos es casi perfecta. Nuestra calibraci\u00f3n permite medir distancias con una precisi\u00f3n del 3%.<\/figcaption><\/figure>\n<p><iframe loading=\"lazy\" title=\"Estrellas binarias eclipsantes\" width=\"790\" height=\"444\" src=\"https:\/\/www.youtube.com\/embed\/UfQ7y7hVcAI?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/p>\n<p>Imagen destacada: estrellas binarias eclipsantes<\/p>\n<p>Cr\u00e9dito\u00a0ESO\/L. Cal\u00e7ada www.eso.org[\/fusion_text][:]<\/p>","protected":false},"excerpt":{"rendered":"<p>Por Dariusz Graczyk, investigador postdoctoral Instituto Milenio de Astrof\u00edsica MAS<\/p>","protected":false},"author":3,"featured_media":29231,"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":[59,1],"tags":[],"class_list":["post-15960","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-columnas","category-uncategorized"],"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: Binarias eclipsantes que ayudan a calibrar una regla c\u00f3smica universal - 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-binarias-eclipsantes-que-ayudan-a-calibrar-una-regla-cosmica-universal\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nuestra Investigaci\u00f3n: Binarias eclipsantes que ayudan a calibrar una regla c\u00f3smica universal - 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