منابع مشابه
Microlensing of Circumstellar Disks
We investigate the microlensing effects on a source star surrounded by a circumstellar disk, as a function of wavelength. In the midand far-infrared, where the emission of the system is dominated by the cold dusty disk, the microlensing light curve encodes the geometry and surface brightness profile of the disk. For a system located at the Galactic center, we find typical magnifications to be o...
متن کاملMicrolensing of circumstellar envelopes II. Emission lines from radial and azimuthal flow during fold caustic crossings
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 demonstra...
متن کاملThe polarisation signature from microlensing of circumstellar envelopes in caustic crossing events
In recent years it has been shown that microlensing is a powerful tool for examining the atmospheres of stars in the Galactic Bulge and Magellanic Clouds. The high gradient of magnification across the source during both small impact parameter events and caustic crossings offers a unique opportunity for determining the surface brightness profile of the source. Furthermore, models indicate that t...
متن کاملMicrolensing of Circumstellar Envelopes III. Line profiles from stellar winds in homologous expansion
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 circu...
متن کاملMicrolensing of circumstellar envelopes I. Simplified considerations for diagnosing radial and azimuthal flow
This paper presents first results on the line profile shapes from a circumstellar envelope in bulk motion as modified by a microlensing event. Only geometrically and optically thin spherical shells in uniform expansion or rotation are considered here so as to emphasise the information content available in the profile shapes. In particular it is demonstrated that for the case of expansion, the l...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2006
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20054407