Facing the problems on the determination of stellar temperatures and gravities: Galactic globular clusters

16 Mar 2020 Mucciarelli A. Bonifacio P.

We analysed red giant branch stars in 16 Galactic globular clusters, computing their atmospheric parameters both from the photometry and from excitation and ionisation balances. The spectroscopic parameters are lower than the photometric ones and this discrepancy increases decreasing the metallicity, reaching, at [Fe/H]~-2.5 dex, differences of ~350 K in effective temperature and ~1 dex in surface gravity... (read more)

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Categories


  • SOLAR AND STELLAR ASTROPHYSICS
  • ASTROPHYSICS OF GALAXIES