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Spectroscopic Hα and Hγ survey of field Be stars: 2004–2009

Published online by Cambridge University Press:  12 July 2011

Erika D. Grundstrom
Affiliation:
Dept. of Physics & Astronomy, Vanderbilt University, Nashville, TN 37235USA email: erika.grundstrom@vanderbilt.edu Dept. of Physics, Fisk University, Nashville, TN 37208, USA
Douglas R. Gies
Affiliation:
CHARA, Georgia State University, Atlanta, GA 30302, USA
Christina Aragona
Affiliation:
Dept. of Physics, Lehigh University, Bethlahem, PA 18015, USA
Tabetha S. Boyajian
Affiliation:
CHARA, Georgia State University, Atlanta, GA 30302, USA
E. Victor Garcia
Affiliation:
Dept. of Physics, Fisk University, Nashville, TN 37208, USA
Amber N. Marsh
Affiliation:
Dept. of Physics, Lehigh University, Bethlahem, PA 18015, USA
M. Virginia McSwain
Affiliation:
Dept. of Physics, Lehigh University, Bethlahem, PA 18015, USA
Rachael M. Roettenbacher
Affiliation:
Dept. of Physics, Lehigh University, Bethlahem, PA 18015, USA
Stephen J. Williams
Affiliation:
CHARA, Georgia State University, Atlanta, GA 30302, USA
David W. Wingert
Affiliation:
CHARA, Georgia State University, Atlanta, GA 30302, USA
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Abstract

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Massive O- and B-type stars are “cosmic engines” in the Universe and can be the dominant source of luminosity in a galaxy. The class of 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. Currently, we are unsure as to why these stars rotate so quickly but three scenarios are possible: they may have been born as rapid rotators, spun up by binary mass transfer, or spun up during the main-sequence evolution of B stars. In order to investigate these scenarios for this population of massive stars, we have been spectroscopically observing a set of 115 field Be stars with the Kitt Peak Coudè Feed telescope in both the Hα and Hγ wavelength regimes since 2004. This time baseline allows for examination of variability properties of the circumstellar disks as well as determine candidates for closer examination for binarity. We find that 90% of the observed stars show some variability with 8% showing significant variability over the 5-year baseline. Such values may be compared with the significant variability seen in some clusters such as NGC 3766 (McSwain 2008). Also, while ~20% of the sample consists of known binaries, we find that another 15–30% of the sample shows indications of binarity.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

McSwain, M. V. 2008, ApJ, 686, 1269CrossRefGoogle Scholar
Porter, J. M. & Rivinius, T. 2003, PASP, 115, 1153CrossRefGoogle Scholar
Yudin, R. V. 2001, A&A, 368, 912Google Scholar