AAS 196th Meeting, June 2000
Session 4. Young Stars and Their Environments
Display, Monday, June 5, 2000, 9:20am-6:30pm, Empire Hall South

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[4.04] Variable Circumstellar Absorption Around Nearby A Stars

J.E. Neff (College of Charleston), K.P. Cheng (Cal State Fullerton), D. Maxwell (College of Charleston), D. Martino (Cal State Fullerton)

We completed a survey of 62 nearby A stars using infrared, ultraviolet, and visible data to look for evidence of circumstellar material. Our multiwavelength survey of circumstellar material has allowed us to determine physical properties of the gas and dust around these nearby stars.

During our survey, we also detected several new systems with variable circumstellar absorption line profiles, similar to that seen in spectra of Beta Pictoris. These new systems allow us to evaluate models of proto-planetary disks, such as the evaporating comet model proposed for Beta Pic. We have been monitoring these candidate systems using high-resolution, high-s/n Ca II K and Na I D spectra obtained with the 2.7m telescope at McDonald Observatory and the 1.9m telescope at Mount Stromlo. We will present the results from our ground-based monitoring of systems variable circumstellar absorptions.

This work is being supported by grant number AST-9819737 from the NSF/RUI program to the California State University at Fullerton and the College of Charleston.

If you would like more information about this abstract, please follow the link to http://www.cofc.edu/~neffj/. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

The author(s) of this abstract have provided an email address for comments about the abstract: neffj@cofc.edu

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