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Title:
High-resolution elemental abundance analysis of the Hyades supercluster
Authors:
de Silva, G. M.; Freeman, K. C.; Bland-Hawthorn, J.; Asplund, M.; Williams, M.; Holmberg, J.
Affiliation:
AA(Australian Astronomical Observatory, PO Box 296, NSW 1710, Australia), AB(Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Australian National University, ACT 2611, Australia), AC(Institute of Astronomy, School of Physics, University of Sydney, NSW 2006, Australia), AD(Max Planck Institute for Astrophysics, Karl-Schwarzschild-strasse 1, Garching 85741, Germany), AE(Astrophysikalisches Institut Potsdam, An der Sternwarte 16, Potsdam D-14482, Germany), AF(The Niels Bohr Institute, Astronomy Group, Juliane Maries Vej 30, 2100 Copenhagen, Denmark)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 415, Issue 1, pp. 563-575. (MNRAS Homepage)
Publication Date:
07/2011
Origin:
WILEY
Astronomy Keywords:
Galaxy: abundances, Galaxy: disc, open clusters and associations: individual: Hyades supercluster
Abstract Copyright:
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:
10.1111/j.1365-2966.2011.18728.x
Bibliographic Code:
2011MNRAS.415..563D

Abstract

The existence of a kinematically defined moving group of stars centred at U=-40, V=-17 km s-1, referred to as the Hyades supercluster, has been suggested to be the debris of an originally large star-forming event, with its core being the present-day Hyades open cluster. Using high-resolution UV-Visual Echelle Spectrograph (UVES) spectra, we present the elemental abundances for a range of alpha, Fe-peak and neutron-capture elements for 26 proposed supercluster stars. Our results show that the sample stars display a heterogeneous abundance distribution, with a clump around [Fe/H] =+0.15. We also calculate stellar radial velocities and U, V, W space velocities. Enforcing strict chemical and kinematical membership criteria, we find that four supercluster stars share the Hyades open cluster abundances and kinematics, while many of the remaining stars fit the disc field kinematics and abundance range. We discuss our findings in the context of the Hyades supercluster being a dispersed star-forming remnant, a stellar stream of purely dynamical origin or a result of several processes. Based on observations made at the European Southern Observatory, Paranal, Chile (ESO programmes 080.D-0094(A) and 381.B-0045(A)).

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