SIMBAD references

2017MNRAS.469.1330A - Mon. Not. R. Astron. Soc., 469, 1330-1353 (2017/August-1)

NGC 6067: a young and massive open cluster with high metallicity.


Abstract (from CDS):

NGC 6067 is a young open cluster hosting the largest population of evolved stars among known Milky Way clusters in the 50-150 Ma age range. It thus represents the best laboratory in our Galaxy to constrain the evolutionary tracks of 5-7 M stars. We have used high-resolution spectra of a large sample of bright cluster members (45), combined with archival photometry, to obtain accurate parameters for the cluster as well as stellar atmospheric parameters. We derive a distance of 1.78 ± 0.12 kpc, an age of 90 ± 20 Ma and a tidal radius of 14.8+6.8–3.2 arcmin. We estimate an initial mass above 5700 M, for a present-day evolved population of two Cepheids, two A supergiants and 12 red giants with masses ≃6 M. We also determine chemical abundances of Li, O, Na, Mg, Si, Ca, Ti, Ni, Rb, Y and Ba for the red clump stars. We find a supersolar metallicity, [Fe/H] = +0.19 ± 0.05, and a homogeneous chemical composition, consistent with the Galactic metallicity gradient. The presence of a Li-rich red giant, star 276 with A(Li) = 2.41, is also detected. An overabundance of Ba is found, supporting the enhanced s-process. The ratio of yellow to red giants is much smaller than 1, in agreement with models with moderate overshooting, but the properties of the cluster Cepheids do not seem consistent with current Padova models for supersolar metallicity.

Abstract Copyright: © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: abundances - stars: fundamental parameters - Hertzsprung-Russell and colour-magnitude diagrams - stars: late-type - stars: variables: Cepheids - open clusters and associations: individual: NGC 6067 - open clusters and associations: individual: NGC 6067

VizieR on-line data: <Available at CDS (J/MNRAS/469/1330): table1.dat table5.dat table6.dat table9.dat tablea1.dat tablea2.dat>

Simbad objects: 134

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