Cosmic Ray origin in OB Associations and Preferential Acceleration of Refractory Elements: Evidence from Abundances of Elements _(26)Fe through _(34)Se

• Published in: The Astrophysical Journal
• Main Authors: Rauch, B. F., Link, J. T., Lodders, K., Israel, M. H., Barbier, L. M., Binns, W. R., Christian, E. R., Cummings, J. R., de Nolfo, G. A., Geier, S., Mewaldt, R. A., Mitchell, J. W., Schindler, S. M., Scott, L. M., Stone, E. C., Streitmatter, R. E., Waddington, C. J., Wiedenbeck, M. E.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: American Astronomical Society 2009
• Subjects: cosmic rays; Galaxy: abundances; ISM: abundances; stars: winds; outflows; Antarc*; Antarctica
• Online Access: https://doi.org/10.1088/0004-637X/697/2/2083

We report abundances of elements from _(26)Fe to _(34)Se in the cosmic radiation measured during fifty days of exposure of the Trans-Iron Galactic Element Recorder (TIGER) balloon-borne instrument. These observations add support to the concept that the bulk of cosmic ray acceleration takes place in OB associations, and they further support cosmic ray acceleration models in which elements present in interstellar grains are accelerated preferentially compared with those found in interstellar gas. © 2009 The American Astronomical Society. Received 2009 January 30; accepted 2009 March 27; published 2009 May 18. We gratefully acknowledge the excellent work of the staff of the Columbia Scientific Balloon Facility, the NASA Balloon Program Office, and the NSF Office of Polar Programs who together made possible two successful long-duration balloon flights over Antarctica. This research was supported by NASA at Washington University (grant NNG05WC04G), Goddard Space Flight Center, the California Institute of Technology (grant NNG05WC21G), and Caltech's Jet Propulsion Laboratory. K.L.'s participation at Washington University was supported by the NSF (grant AST0807356). Published - Rauch2009p4297Astrophys_J.pdf Erratum - Rauch2010p11723Astrophys_J.pdf