General Seminar

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General Seminar takes place every Monday at 11.15 in Piwnice, radioastronomy seminar room.
Remote participation via the BigBlueButton (BBB).

26 May 2025

“Open clusters in the LAMOST observations – Pleiades”

dr hab. Joanna Molenda-Żakowicz
Astronomical Institute, University of Wrocław, Wrocław, Poland

Abstract:
We invite you to attend a seminar presenting recent findings from a comprehensive spectroscopic study of late-type stars in the Pleiades open cluster, based on medium-resolution observations from the LAMOST telescope. The study delivers new insights into stellar parameters, rotational velocities, magnetic activity, and lithium abundances across 283 likely cluster members. Utilizing the ROTFIT code and photometric data from TESS, the authors achieved precise characterizations of stellar properties and uncovered key signatures of stellar youth, such as chromospheric emission, rotational modulation, and lithium abundance. This work refines the cluster’s age to 118 ± 6 Myr and confirms classic trends in activity-rotation relations, while also identifying numerous binary systems and detecting stellar flares. These results underscore the capability of LAMOST-MRS data for advancing our understanding of stellar evolution in young open clusters.