Probing the atmosphere of the bulge G5III star OGLE-2002-BUL-069 by analysis of microlensed Hα line
Cassan, A; Beaulieu, J.-P; Brillant, S; Coutures, C; Dominik, M; Donatowicz, J; Jorgensen, U G; Kubas, D; Albrow, M; Caldwell, J A R; Fouque, P; Greenhill, J; Hill, Kym; Horne, Keith; Kane, S; Martin, R; Menzies, J; Pollard, K R; Sahu, K C; Vinter, C; Wambsganss, J; Watson, R; Williams, Andrew; Fendt, C; Hauser, Andreas; Heinmuller, J; Marquette, J B; Thurl, Christine; Hauschildt, Peter H
We discuss high-resolution, time-resolved spectra of the caustic exit of the binary microlensing event OGLE 2002-BLG-069 obtained with UVES on the VLT. The source star is a G5III giant in the Galactic Bulge. During such events, the source star is highly magnified, and a strong differential magnification around the caustic resolves its surface. Using an appropriate model stellar atmosphere generated by the PHOENIX v2.6 code we obtain a model light curve for the caustic exit and compare it with a...[Show more]
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