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Extended shells around B[e] stars - implications for B[e] star evolution

Marston, M. P. and McCollum, B. (2008) Extended shells around B[e] stars - implications for B[e] star evolution. Astronomy and Astrophysics, 477 (1). pp. 193-202. ISSN 0004-6361. doi:10.1051/0004-6361:20066086.

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Aims. The position of B[e] stars in the upper left part of the Hertzsprung-Russell diagram creates a quandary. Are these stars young stars evolving onto the main sequence or old stars that are evolving off of it? Spectral characteristics suggest that B[e] stars can be placed into five subclasses and are not a homogeneous set. Such sub-classification is believed to coincide with varying origins and different evolutions. However, the evolutionary connection of B[e] stars – and notably sgB[e] – to other stars is unclear, particularly to evolved massive stars. We attempt to provide insight into the evolutionary past of B[e] stars. Methods. We performed an Hα narrow-band CCD imaging survey of B[e] stars, in the northern hemisphere. Prior to the current work, no emission-line survey of B[e] stars had yet been made, while only two B[e] stars appeared to have a shell nebula as seen in the Digital Sky Survey. Of nebulae around B[e] stars, only the ring nebula around MWC137 has been previously observed extensively. Results. In this presentation we report the findings from our narrow-band optical imaging survey of the environments of 25 B[e] stars. Of the objects surveyed, 7 show bipolar or uni- polar structures up to 15' across; 5 show faint, large, or filamentary shells; and 2 are compact planetary nebula-type systems. The most spectacular system observed is a large bipolar structure associated with MWC314. Conclusions. The possible links between B[e] stars and other evolved stars, implied by our observations, are investigated.

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Additional Information:© ESO 2007. Received 21 July 2006. Accepted 15 October 2007. This research has made use of the SIMBAD database, operated at CDS, Strasbourg, France.
Subject Keywords:stars: emission line, Be; stars: circumstellar material; stars: evolution
Issue or Number:1
Record Number:CaltechAUTHORS:20090510-204718311
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14192
Deposited By: Joy Painter
Deposited On:03 Jun 2009 00:02
Last Modified:08 Nov 2021 22:44

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