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Title:
Toward Mapping the Detailed Density Structure of Classical Be Circumstellar Disks
Authors:
Wisniewski, J. P.; Kowalski, A. F.; Bjorkman, K. S.; Bjorkman, J. E.; Carciofi, A. C.
Affiliation:
AA(NASA Goddard Space Flight Center, Greenbelt, MD; .; NPP Fellow.; Visiting Astronomer at the Infrared Telescope Facility, which is operated by the University of Hawaii under cooperative agreement NCC 5-538 with the National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program.), AB(Department of Physics, University of Chicago, Chicago, IL.; Currently at Department of Astronomy, University of Washington, Seattle, WA; .), AC(Visiting Astronomer at the Infrared Telescope Facility, which is operated by the University of Hawaii under cooperative agreement NCC 5-538 with the National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program.; Department of Physics and Astronomy, University of Toledo, Toledo, OH; , .), AD(Visiting Astronomer at the Infrared Telescope Facility, which is operated by the University of Hawaii under cooperative agreement NCC 5-538 with the National Aeronautics and Space Administration, Science Mission Directorate, Planetary Astronomy Program.; Department of Physics and Astronomy, University of Toledo, Toledo, OH; , .), AE(Instituto de Astronomia, Geofìsica, e Ciências Atmosfèricas, Universidade de São Paulo, São Paulo, Brazil; .)
Publication:
The Astrophysical Journal, Volume 656, Issue 1, pp. L21-L24. (ApJL Homepage)
Publication Date:
02/2007
Origin:
UCP
ApJ Keywords:
Stars: Circumstellar Matter, Stars: Emission-Line, Be, stars: individual (48 Librae), Stars: Individual: Constellation Name: ζ Tauri
DOI:
10.1086/512123
Bibliographic Code:
2007ApJ...656L..21W

Abstract

The first results from a near-contemporaneous optical and infrared spectroscopic observing program designed to probe the detailed density structure of classical Be circumstellar disks are presented. We report the discovery of asymmetrical infrared emission lines of He I, O I, Fe II, and the Brackett, Paschen, and Pfund series lines of H I that exhibit an opposite V/R orientation (V>R) to that observed for the optical Balmer Hα line (V<R) in the classical Be star ζ Tau. We interpret these data as evidence that the density wave that characterizes ζ Tau's disk has a significantly different average azimuthal morphology in the inner disk region as compared to the outer disk region. A follow-up multiwavelength observational campaign to trace the temporal evolution of these line profile morphologies, along with detailed theoretical modeling, is suggested to test this hypothesis.
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