Diego Bossini (Padova Observatory, INAF)

Asteroseismology of Red Giant Stars: a Tool for Determining Stellar Properties
Wann Am 06.03.2018 von 10:00 bis 11:00
Was
  • Special Seminar
  • Kolloquium
Wo SH, Seminarraum
Termin übernehmen vCal / iCal

Asteroseismology has opened the door to detailed studies of the near-core structure of low-mass stars, which had not been possible before.   Thank to the new constraints it provides, it is now possible to greatly improve our measurements of the basic stellar properties of field and clusters giants observed far across the Galaxy.

Most of such determinations of ages and masses are, up to now, based on simple scaling relations, involving the average large frequency separation (Dnu) and the frequency of maximum power (numax).

In our work we use observed Dnu and the period spacing of gravity mode to set precise constrains on the physics of stellar models: we include these seismic quantities in a detailed grids of isochrones and hence in a Bayesian method of parameter estimation. Tests with synthetic data reveal that masses and ages can be determined with typical precision of 5 and 19 per cent, respectively, down to 3 and 10 per cent when we add independent information on the stellar luminosity.