BEGIN:VCALENDAR VERSION:2.0 PRODID:-//AIP Calendar//www.aip.de// BEGIN:VEVENT SUMMARY:External Colloquium | Gerald Handler (Nicolaus Copernicus Astronom ical Center) DTSTART:20250313T130000Z DTEND:20250313T150000Z DTSTAMP:20260913T133038Z UID:www.aip.de-2021 CATEGORIES:Wissenschaftliches CATEGORIES:Allgemeiner Kalendertermin CATEGORIES:öffentlich CONTACT:Julián Alvarado-Gómez DESCRIPTION:Pulsations and close binary stars: new synergiesAstrophysics d epends on the knowledge of stellar parameters\, structure and evolution\; the more accurate the more insightful. The most accurate stellar parameter s over a wide range of evolutionary stages are determined via the analysis of (detached) eclipsing binary systems\, whereas stellar interior structu re can be inferred from investigations of stellar oscillations - asterosei smology. However\, there are some ambiguities in these methods that can be resolved applying both methods\, to pulsating stars in binary systems. On the other hand\, proximity effects can complicate such analysis - or be a n asset. An example are the so-called tidally tilted pulsators\, stars in close binary systems that have their pulsational axes tilted into the orbi tal plane by the gravitational pull of their companion. Such objects were serendipitously discovered in space photometric data from NASA'\;s TES S mission. One of their assets is that one sees the pulsations over all as pect angles during an orbital cycle. This permits their association with t he surface distortions they create\, leading to pulsational mode identific ation\, and thus overcomes of the most important obstacles for asteroseism ology. Another useful feature of these objects is that the orbital and pul sational geometries depend on each other and can therefore be determined i n two ways. Recently it has been realized that some of these objects pulsa te around three different axes. A theory has been developed to explain the physical origin of triaxial pulsations and that predicts how these can be identified\, and the first observational proofs have been obtained. Triax ial pulsators hold the promise to sound stellar interiors in 3D. In this p resentation\, this very new field of research will be reviewed and it is a ttempted to convey a good perception of the geometries involved.\n LOCATION:Maria Margaretha Kirch Haus Conference Room END:VEVENT END:VCALENDAR