Volume 401, Number 1, April I 2003
|Page(s)||339 - 346|
|Published online||17 March 2003|
Microlensing of circumstellar envelopes
II. Emission lines from radial and azimuthal flow during fold caustic crossings
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
Corresponding author: H. M. Bryce, email@example.com
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
© ESO, 2003
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