Computer Science – Learning
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542804g&link_type=abstract
American Astronomical Society, AAS Meeting #215, #428.04; Bulletin of the American Astronomical Society, Vol. 42, p.345
Computer Science
Learning
Scientific paper
Be stars are rapidly rotating B-type stars that lose mass in an equatorial, circumstellar disk (Porter & Rivinius 2003) and cause Balmer and other line emission. Since the fall of 2004, we have been spectroscopically observing a set of 115 field Be stars with the Kitt Peak Coude Feed telescope. This time baseline and the use of the region around H-gamma allows for examination of variability properties of the circumstellar disks and environment as well as determine candidates for closer examination for binarity and/or non-radial pulsation. We find that the majority of the observed stars show some variability with only a few percent showing significant variability in this wavelength regime over the 5-year baseline. Such values may be compared with the significant variability seen in some clusters such as NGC 3766 (McSwain et al. 2008). Also, while 20% of the sample consists of known binaries, we find that another 15-30% of the sample shows indications of binarity. We also discuss our findings that over half of the sample show shell features of some kind.
This work has been supported in part by a grant from the Vanderbilt University Learning Sciences Institute, NASA grant NNX08AV70G, NSF Career grant AST-0349075, and NSF AST-0849736.
Boyajian Tabetha S.
Garcia Edenise
Gies Douglas R.
Grundstrom Erika
Williams Jeffress S.
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