{"id":896,"date":"2026-01-18T08:21:06","date_gmt":"2026-01-18T07:21:06","guid":{"rendered":"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/?post_type=eap_event&#038;p=896"},"modified":"2026-04-22T10:15:02","modified_gmt":"2026-04-22T08:15:02","slug":"good-vibrations-seminar-s04e08-lea-schimak-university-of-sydney-australia","status":"publish","type":"eap_event","link":"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/events\/good-vibrations-seminar-s04e08-lea-schimak-university-of-sydney-australia\/","title":{"rendered":"Good Vibrations Seminar S04E08: Lea Schimak (University of Sydney, Australia)"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">Why is it so hard to model red clump stars?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/files\/2026\/01\/CV_LeaSchimak.pdf\">Lea Schimak (University of Sydney, Australia)<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Asteroseismology has long been proven to be a powerful tool for probing the interior of stars and testing stellar models. For red clump (RC) stars, which experienced a He-flash in their past, these tests show limited success compared to main-sequence or red giant branch (RGB) stars of a similar mass range. The models are confronted with various discrepancies and numerical issues. For example, RC stars in clusters often provide inconsistent ages compared to their RGB counterparts; the observed period spacing suggests enhanced core overshooting; and at the convective core boundary, the models often predict a split convection zone due to the sharp changes in the composition gradient.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In this talk, I will present how standard models fail, what has been done to improve them and discuss different asteroseismic constraints to further investigate the discrepancies. I will explore standard models using the asteroseismic binary system KIC 1081730, consisting of an RC and RGB star and measure the frequency-dependent coupling strength of mixed modes as a surface-independent parameter to probe the inside of red giants and discuss how this parameter is an excellent probe, especially for the structure of RC stars.<\/p>\n\n\n\n<video src=\"https:\/\/asteroseismolo.gy\/goodvibes\/S4\/8.mp4\" controls style=\"width: 100%\">\nVideo recording can be found <a href=\"https:\/\/asteroseismolo.gy\/goodvibes\/S4\/8.mp4\">here<\/a>.\n<\/video>\n","protected":false},"excerpt":{"rendered":"<p>Why is it so hard to model red clump stars? Lea Schimak (University of Sydney, Australia) Asteroseismology has long been<\/p>\n<p class=\"readmore\"><a href=\"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/events\/good-vibrations-seminar-s04e08-lea-schimak-university-of-sydney-australia\/\" title=\"Read Good Vibrations Seminar S04E08: Lea Schimak (University of Sydney, Australia)\">Read more &raquo;<\/a><\/p>\n","protected":false},"author":104,"featured_media":899,"comment_status":"open","ping_status":"closed","template":"","categories":[],"class_list":["post-896","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>Good Vibrations Seminar S04E08: Lea Schimak (University of Sydney, Australia) - 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-s04e08-lea-schimak-university-of-sydney-australia\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Good Vibrations Seminar S04E08: Lea Schimak (University of Sydney, Australia) - The good vibrations seminars series\" \/>\n<meta property=\"og:description\" content=\"Why is it so hard to model red clump stars? Lea Schimak (University of Sydney, Australia) Asteroseismology has long beenRead more &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/events\/good-vibrations-seminar-s04e08-lea-schimak-university-of-sydney-australia\/\" \/>\n<meta property=\"og:site_name\" content=\"The good vibrations seminars series\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-22T08:15:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sites-lira.obspm.fr\/the-good-vibrations-seminars\/files\/2026\/01\/schimak.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"512\" \/>\n\t<meta property=\"og:image:height\" content=\"512\" \/>\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-s04e08-lea-schimak-university-of-sydney-australia\\\/\",\"url\":\"https:\\\/\\\/sites-lira.obspm.fr\\\/the-good-vibrations-seminars\\\/events\\\/good-vibrations-seminar-s04e08-lea-schimak-university-of-sydney-australia\\\/\",\"name\":\"Good Vibrations Seminar S04E08: Lea Schimak (University of Sydney, Australia) - 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