Stellar Pollution in the Solar Neighborhood

Details Stellar Pollution in the Solar Neighborhood Stellar Pollution in the Solar Neighborhood

2000-11-28

arxiv.org/abs/astro-ph/0011530v1

Astronomy and Astrophysics

Astrophysics

33 pages, 11 figures. Submitted to ApJ

Scientific paper

10.1086/321527

We study spectroscopically determined iron abundances of 642 solar-type stars to search for the signature of accreted iron-rich material. We find that the metallicity [Fe/H] of a subset of 466 main sequence stars, when plotted as a function of stellar mass, mimics the pattern seen in lithium abundances in open clusters. Using Monte Carlo models we find that, on average, these stars have accreted about 0.4 Earth masses of iron while on the main sequence. A much smaller sample of 19 stars in the Hertzsprung gap, which are slightly evolved and whose convection zones are significantly more massive, have lower average [Fe/H], and their metallicity shows no clear variation with stellar mass. These findings suggest that terrestrial-type material is common around solar type stars.

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