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Near-infrared excess and emission characteristics of classical Be stars

Published online by Cambridge University Press:  12 July 2011

Chien-De Lee ,
Wen-Ping Chen  and
Daisuke Kinoshita
Chien-De Lee
Affiliation:
Graduate Institute of Astronomy, National Central University, Jhongli 32001, Taiwan, email: [email protected]
Wen-Ping Chen
Affiliation:
Graduate Institute of Astronomy, National Central University, Jhongli 32001, Taiwan, email: [email protected] Department of Physics, National Central University, Jhongli 32001, Taiwan, email: [email protected]
Daisuke Kinoshita
Affiliation:
Graduate Institute of Astronomy, National Central University, Jhongli 32001, Taiwan, email: [email protected]
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Abstract

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Classical Be (CBe) stars are fast-rotating emission-line stars associated with infrared excess often attributed to plasma free-free emission. A few with exceptionally large near-infrared excess, namely with (J–H) and (H–Ks) both greater than 0.6 mag, however, must be accounted for by thermal emission from circumstellar dust. From 2007 to 2009, spectra of more than 100 CBe stars have been collected. We present some of these spectra and discuss how temporal correlation (or lack of) among spectral features would provide possible diagnosis of the origin of the CBe phenomena.

Keywords

stars: early-typestars: evolutionstars: emission-lineBestars: pre–main-sequenceinfrared: stars
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. 404 - 405
Copyright
Copyright © International Astronomical Union 2011

References

Lee, C. D. & Chen, W. P. 2009, in: Soonthornthum, B., Komonjinda, S., Cheng, K. S., & Leung, K. C. (eds.), Stellar pulsation: challenges for theory and observation, ASP-CS 404, p. 302Google Scholar
Zhang, P., Chen, P. S. & Yang, H. T. 2005, New Astron. 10, 325CrossRefGoogle Scholar