NGC 6067: A young and massive open cluster with high metallicity
Authors
Alonso-Santiago, J
Negueruela, I
Marco, A
Tabernero, HM
González-Fernández, C
Castro, N
Publication Date
2017-08Journal Title
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
Publisher
Oxford University Press (OUP)
Volume
469
Issue
2
Pages
1330-1353
Type
Article
Metadata
Show full item recordCitation
Alonso-Santiago, J., Negueruela, I., Marco, A., Tabernero, H., González-Fernández, C., & Castro, N. (2017). NGC 6067: A young and massive open cluster with high metallicity. Monthly Notices of the Royal Astronomical Society, 469 (2), 1330-1353. https://doi.org/10.1093/MNRAS/STX783
Abstract
© 2017 The Authors. NGC6067 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 5-7M⊙ 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 -3.2+6.8 arcmin. We estimate an initial mass above 5700M⊙, for a present-day evolved population of two Cepheids, two A supergiants and 12 red giants with masses ≈6M⊙. 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.
Embargo Lift Date
2100-01-01
Identifiers
External DOI: https://doi.org/10.1093/MNRAS/STX783
This record's URL: https://www.repository.cam.ac.uk/handle/1810/285766
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