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June 1, 2026
Dear all,
We will have our next Astro Seminar of the year next Monday, June 1st in Aud. A at 14.15. The speaker will be Ylva Götberg (ISTA), who will talk about “Stars stripped in binaries: from theory to observation”.
For more details on upcoming seminars, kindly check the website: https://nbia.nbi.ku.dk/nbia-events/nbia-seminars/.
Kind regards,
Alejandro (on behalf of the organisers)
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Date: June 1st, 2026
Time: 14:15
Location: Auditorium A
Speaker: Ylva Götberg (ISTA)
Title: Stars stripped in binaries: from theory to observation
Abstract: A third of all massive stars are predicted to lose their hydrogen-rich envelope through mass transfer or common envelope ejection initiated by a binary companion star. As a result, the hot and compact helium core is exposed. These "stripped stars" are the direct progenitors of hydrogen-poor supernovae and merging binary neutron stars, but they are also so hot that they should boost the ionizing output from bursty star-forming galaxies. Despite their importance, stripped stars remained, until recently, observationally unconfirmed since their predicted existence over half a century ago. We found the first set of stripped stars by combining ultraviolet and optical photometry with follow-up spectroscopy in the Magellanic Clouds. By fitting their spectra with a new grid of models, we could measure stellar properties and thus confirm that the predictions from binary evolution models are broadly consistent with observed stripped stars.
