Artículos de revistas
Segue 3: the youngest globular cluster in the outer halo
Fecha
2013Registro en:
Monthly Notices of the Royal Astronomical Society, Oxford, v. 433, p. 1966-1969, 2013
10.1093/mnras/stt865
Autor
Ortolani, S.
Bica, E
Barbuy, Beatriz Leonor Silveira
Institución
Resumen
Deep Galileo (Telescopio Nazionale Galileo) B, V and I images of Segue 3, reaching V ∼ 25, reveal that it is the youngest globular cluster known so far in the Galaxy. A young age of 3.2 Gyr is found, differently from a previous estimate of 12 Gyr. It also appears to be moderately metal rich with [Fe/H] ∼ −0.8, rather than [Fe/H] ∼ −1.7, as previously suggested by Fadely et al. A main difference in the age derivation relative to Fadely et al. comes from the consideration of subgiant branch stars in the isochrone fitting. A deduced distance of d⊙ = 29.1 kpc is compatible with the outer halo location of other low luminosity globular clusters.