Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-12-03
Astrophys.J. 622 (2005) 704-713
Astronomy and Astrophysics
Astrophysics
29 pages, 10 figures, accepted for publication by the Astrophysical Journal; one reference corrected
Scientific paper
10.1086/427909
Abundance analyses of stars with planets have revealed that their metallicities are enhanced relative to field stars. Such a trend was originally suggested to be due to accretion of iron-rich planetary material. Based on this assumption, we have developed a stellar evolution code to model stars with non-uniform metallicity distributions. We have calculated ``polluted'' stellar evolution tracks for stars with M=0.9-1.2 M_sun. Our models encompass a range of initial metal content from Z=0.01 to 0.03, and include metallicity enhancements within the stellar convection zone corresponding to Delta-Z=0.005-0.03. We find that the primary effects of metal enhancement on stellar structure and evolution are expansion of the convection zone and downward shift of effective temperature. In addition, we have computed the surface metallicities expected for stars of different mass for fixed quantities of pollution; there appears to be no correlation with present observational data on the metallicities of stars known to harbor planets.
Cody Ann Marie
Sasselov Dimitar
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