Disentangling the Hercules stream

Research output: Contribution to journalArticle


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.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Astronomy, Astrophysics and Cosmology


  • stars : abundances, neighborhood, solar, Galaxy : formation, galaxy : disk, Galaxy : evolution, stars : kinematics
Original languageEnglish
Pages (from-to)L89-L92
JournalAstrophysical Journal
Issue number2
Publication statusPublished - 2007
Publication categoryResearch