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Properties of the circumstellar dust in galactic FS CMa objects

Published online by Cambridge University Press:  12 July 2011

Anatoly S. Miroshnichenko ,
Richard O. Gray ,
Karen S. Bjorkman ,
Richard J. Rudy ,
David K. Lynch  and
Alex C. Carciofi
Anatoly S. Miroshnichenko
Affiliation:
Dept. of Physics & Astronomy, University of North Carolina at Greensboro, P.O. Box 26170, Greensboro, NC 27402–6170, USA; email: [email protected]
Richard O. Gray
Affiliation:
Dept. of Physics & Astronomy, Appalachian State University, Boone, NC 28608, USA
Karen S. Bjorkman
Affiliation:
Ritter Observatory, University of Toledo, Toledo, OH 43606, USA
Richard J. Rudy
Affiliation:
The Aerospace Corp., M2/266, P.O.Box 92957, Los Angeles, CA 90009, USA
David K. Lynch
Affiliation:
Thule Scientific, Topanga, CA 90290, USA
Alex C. Carciofi
Affiliation:
Instituto de Astronomia, Geofisica e Ciencias Atmosfericas, Universidade de São Paulo, Rua do Matao 1226, Cidade Universitaria, São Paulo, SP 05508–900, Brazil
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Abstract

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FS CMa objects are a group of hot stars that exhibit the B[e] phenomenon. The group was defined a few years ago on the basis of the formerly known unclassified B[e] stars and newly discovered objects. One of their main features is the presence of hot circumstellar dust whose properties were unknown. We present IR spectra of nearly 20 FS CMa objects obtained with the Spitzer Space Telescope. Dusty features, such as broad silicate bands in emission and narrow bands that are usually explained by PAHs, are detected. The IR fluxes are compared to those detected by IRAS and MSX. Main results of the data analysis are briefly discussed.

Keywords

stars: early-typeinfrared: starscircumstellar matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 412 - 413
Copyright
Copyright © International Astronomical Union 2011

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