Query : 2006A&A...450.1023H

2006A&A...450.1023H - Astronomy and Astrophysics, volume 450, 1023-1035 (2006/5-2)

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


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): stars: circumstellar matter - gravitational lensing - stars: atmospheres - techniques: spectroscopic

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10685 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16753 1
3 GRB 000301C gB 16 20 18.5 +29 26 35           ~ 351 0
4 MACHO 95-BLG-30 * 18 07 04.4 -27 22 06     16.21     M4III 39 0

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