{"id":742,"date":"2022-09-30T17:31:06","date_gmt":"2022-09-30T15:31:06","guid":{"rendered":"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/?post_type=eap_event&#038;p=742"},"modified":"2023-03-17T14:17:26","modified_gmt":"2023-03-17T13:17:26","slug":"good-vibrations-seminar-s3e6-emma-willett-university-of-birmingham","status":"publish","type":"eap_event","link":"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/events\/good-vibrations-seminar-s3e6-emma-willett-university-of-birmingham\/","title":{"rendered":"\u201cGood Vibrations Seminar S3E6\u201d: Emma Willett (University of Birmingham, UK)"},"content":{"rendered":"\n<figure class=\"wp-block-embed-youtube wp-block-embed is-type-video is-provider-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" width=\"870\" height=\"489\" src=\"https:\/\/www.youtube.com\/embed\/DjHO3PSgk9M?list=PLCswBYjvdjkpj-5lwWMMYwPc8k-rhyf3Z\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Milky Way helium enrichment constrained by red clump stars.<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The helium mass fraction, Y, is an important constraint in stellar models. For low-mass stars, its value is usually estimated by assuming a linear helium-to-metal enrichment ratio, DY\/DZ, and so obtaining Y from the measured metal mass fraction, Z. However, the behaviour of DY\/DZ is uncertain, and varies significantly between methods presented in the literature.We use the luminosity of red clump (low-mass, core helium-burning) stars as a proxy for Y, and so investigate the helium enrichment history of the Galaxy. The approach combines asteroseismic results from Kepler with spectroscopy from APOGEE and astrometry from Gaia to allow red clump stars to be used in this way for the first time.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Milky Way helium enrichment constrained by red clump stars. The helium mass fraction, Y, is an important constraint in stellar<\/p>\n<p class=\"readmore\"><a href=\"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/events\/good-vibrations-seminar-s3e6-emma-willett-university-of-birmingham\/\" title=\"Read \u201cGood Vibrations Seminar S3E6\u201d: Emma Willett (University of Birmingham, UK)\">Read more &raquo;<\/a><\/p>\n","protected":false},"author":73,"featured_media":799,"comment_status":"open","ping_status":"closed","template":"","categories":[],"class_list":["post-742","eap_event","type-eap_event","status-publish","has-post-thumbnail","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u201cGood Vibrations Seminar S3E6\u201d: Emma Willett (University of Birmingham, UK) - The good vibrations seminars series<\/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:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/events\/good-vibrations-seminar-s3e6-emma-willett-university-of-birmingham\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u201cGood Vibrations Seminar S3E6\u201d: Emma Willett (University of Birmingham, UK) - The good vibrations seminars series\" \/>\n<meta property=\"og:description\" content=\"Milky Way helium enrichment constrained by red clump stars. The helium mass fraction, Y, is an important constraint in stellarRead more &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/events\/good-vibrations-seminar-s3e6-emma-willett-university-of-birmingham\/\" \/>\n<meta property=\"og:site_name\" content=\"The good vibrations seminars series\" \/>\n<meta property=\"article:modified_time\" content=\"2023-03-17T13:17:26+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/files\/2023\/01\/EWillett_profile.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2268\" \/>\n\t<meta property=\"og:image:height\" content=\"2463\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Estimated reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/the-good-vibrations-seminars\\\/events\\\/good-vibrations-seminar-s3e6-emma-willett-university-of-birmingham\\\/\",\"url\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/the-good-vibrations-seminars\\\/events\\\/good-vibrations-seminar-s3e6-emma-willett-university-of-birmingham\\\/\",\"name\":\"\u201cGood Vibrations Seminar S3E6\u201d: Emma Willett (University of Birmingham, UK) - 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