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Disentangling the Hercules Stream
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Astronomy and Space Physics, Theoretical Astrophysics.
2007 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 655, no 2, L89-L92 p.Article in journal (Refereed) Published
Abstract [en]

Using high-resolution spectra of nearby F and G dwarf stars, we have investigated the detailed abundance and age structure of the Hercules stream. We find that the stars in the stream have a wide range of stellar ages, metallicities, and element abundances. By comparing to existing samples of stars in the solar neighborhood with kinematics typical of the Galactic thin and thick disks, we find that the properties of the Hercules stream distinctly separate into the abundance and age trends of the two disks. Hence, we find it unlikely that the Hercules stream is a unique Galactic stellar population but rather is a mixture of thin and thick disk stars. This points toward a dynamical origin for the Hercules stream, probably caused by the Galactic bar.

Place, publisher, year, edition, pages
2007. Vol. 655, no 2, L89-L92 p.
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-14485DOI: 10.1086/512014ISI: 000243726100007OAI: oai:DiVA.org:uu-14485DiVA: diva2:42255
Available from: 2008-01-30 Created: 2008-01-30 Last updated: 2011-02-18Bibliographically approved

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Gustafsson, Bengt
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