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Abundance analysis and origin of the zeta-sculpturis open cluster

In English

Författare

  • Björn Edvardsson
  • Bertil Petterson
  • Maryam Olsson
  • Bertil Westerlund

Summary, in English

We have determined chemical abundances and radial velocities for stars in the field of the zeta Sculptoris cluster. We find that the cluster metal deficiency previously found from UBV photometry is not supported; the cluster overall metallicity, [Fe/H]=+0.23, is about 70% higher than the solar value. The chemical abundance pattern appears unusual: the Ni/Fe ratio is lower than typical for field stars with similar Fe and Ca abundances, and the cluster may also be deficient in the alpha element Si. For its age, the cluster is unusually far from the galactic disk, =~240pc. The adopted heliocentric cluster radial velocity, +3.9km/s, shows that it is close to its maximum distance from the galactic plane. We suggest that the zetaSculptoris cluster was formed in the galactic disk 45Myr ago by the interaction of a high velocity cloud with the interstellar medium, and that its formation may be connected with that of Gould's Belt.

Publiceringsår

1995

Språk

Engelska

Sidor

75-86

Publikation/Tidskrift/Serie

Astronomy & Astrophysics

Volym

293

Dokumenttyp

Artikel i tidskrift

Förlag

EDP Sciences

Ämne

  • Social Sciences Interdisciplinary
  • Other Engineering and Technologies not elsewhere specified

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0004-6361