Microlensing of circumstellar envelopes III. Line profiles from stellar winds in homologous expansion

Hendry, M.A. , Ignace, R. and Bryce, H.M. (2006) Microlensing of circumstellar envelopes III. Line profiles from stellar winds in homologous expansion. Astronomy and Astrophysics, 450(3), pp. 1023-1035. (doi: 10.1051/0004-6361:20054407)

Abstract

This paper examines line profile evolution due to the linear expansion of circumstellar material obsverved during a microlensing event. This work extends our previous papers on emission line profile evolution from radial and azimuthal flow during point mass lens events and fold caustic crossings. Both "flavours" of microlensing were shown to provide effective diagnostics of bulk motion in circumstellar envelopes. In this work a different genre of flow is studied, namely linear homologous expansion, for both point mass lenses and fold caustic crossings. Linear expansion is of particular relevance to the effects of microlensing on supernovae at cosmological distances. We derive line profiles and equivalent widths for the illustrative cases of pure resonance and pure recombination lines, modelled under the Sobolev approximation. The efficacy of microlensing as a diagnostic probe of the stellar environs is demonstrated and discussed.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Hendry, Professor Martin
• Authors: Hendry, M.A., Ignace, R., and Bryce, H.M.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Research Centre: College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
• Journal Name: Astronomy and Astrophysics
• Publisher: EDP Sciences
• ISSN: 0004-6361
• ISSN (Online): 1432-0746
• Copyright Holders: Copyright © 2006 EDP Sciences
• First Published: First published in Astronomy and Astrophysics 450(3):1023-1035
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher