Probing Red Giant Atmospheres with Gravitational Microlensing

Details Probing Red Giant Atmospheres with Gravitational Microlensing Probing Red Giant Atmospheres with Gravitational Microlensing

1999-02-19

arxiv.org/abs/astro-ph/9902273v2

Astrophys.J. 543 (2000) 406-416

Astronomy and Astrophysics

Astrophysics

23 pages with 11 Postscript figures, submitted to ApJ; Section 2 expanded, references added, text revised

Scientific paper

10.1086/317067

Gravitational microlensing provides a new technique for studying the surfaces of distant stars. Microlensing events are detected in real time and can be followed up with precision photometry and spectroscopy. This method is particularly adequate for studying red giants in the Galactic bulge. Recently we developed an efficient method capable of computing the lensing effect for thousands of frequencies in a high-resolution stellar spectrum. Here we demonstrate the effects of microlensing on synthesized optical spectra of red giant model atmospheres. We show that different properties of the stellar surface can be recovered from time-dependent photometry and spectroscopy of a point-mass microlensing event with a small impact parameter. In this study we concentrate on center-to-limb variation of spectral features. Measuring such variations can reveal the depth structure of the atmosphere of the source star.

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