EDP Sciences
Free access
Volume 401, Number 1, April I 2003
Page(s) 339 - 346
Section Formation and evolution of planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20021769

A&A 401, 339-346 (2003)
DOI: 10.1051/0004-6361:20021769

Microlensing of circumstellar envelopes

II. Emission lines from radial and azimuthal flow during fold caustic crossings
H. M. Bryce1, 2, R. Ignace2 and M. A. Hendry1

1  Dept. of Physics & Astronomy, University of Glasgow, Glasgow G12 8QQ, UK
2  Dept. of Astronomy, University of Wisconsin, 475 North Charter Street, Madison, Wisconsin, 53706, USA

(Received 17 October 2002 / Accepted 2 December 2002 )

This paper examines the line profile evolution due to bulk motion in circumstellar envelopes during microlensing fold caustic crossing events. These events have recently been shown to be a sensitive probe of stellar surface brightness profiles, thus providing a means - through both photometric and spectroscopic observations - to constrain and test stellar atmosphere models. Here it is demonstrated, through the examination of simplified line profiles, that spectroscopic studies of fold caustic crossings could also prove to be a powerful diagnostic of bulk motion in circumstellar envelopes.

Key words: gravitational lensing -- stars: circumstellar matter

Offprint request: H. M. Bryce, bryce@astro.wisc.edu

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