Asteroseismic and spectroscopic study of NGC1647

Recording: https://www.oact.inaf.it/seminars/

DATE: Monday, December 1, 11:00 a.m.

ORGANIZER: INAF-OACT

LOCATION: AULA OVEST (INAF-OACT) + remote

Link for the remote audience:
https://meet.google.com/wvf-uwxo-oyj

SPEAKER: Mingfeng Qin (Beijing Normal University)

ABSTRACT:
NGC1647 is a poorly studied open cluster, with considerable discrepancies in age reported in previous works. To improve the precision of its characterization, we applied HDBSCAN clustering in astrometric space, complemented by radial-velocity filtering, and identified 271 high-confidence cluster members. I will show as isochrone fitting to extinction-corrected photometry can provide a preliminary cluster age range. From TESS and K2 time-series photometry, we identified 95 periodic variables, including nine p-mode pulsators. By fitting stellar evolutionary models to these p-mode pulsators, we derived “asteroseismic” cluster parameters, Age and Metallicity. The seismic metallicity is consistent with spectroscopic estimates, while the derived age exhibits significantly higher precision than traditional isochrone-based results. Moreover, we analyzed LAMOST spectra using the ROTFIT tool and performed SED fitting to determine cluster extinction and conduct gyrochronology studies. This combined approach provides a refined benchmark for the fundamental parameters of NGC1647.

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