The Impact of Stellar Compositional Anomalies on the Evolution of Stellar Habitable Zones.
Abstract
High quality elemental abundances have been derived from radial velocity planet search spectra for more than a hundred nearby dwarf stars, with more to come. Abundances normalized to iron relative to the sun [X/Fe] vary by more than a factor of two at a given metallicity. We present stellar evolution models generated by the TYCHO code for F, G, and K stars with variations in eight elements (C, O, Na, Al, Mg, Si, Ca, Ti) chosen on the basis of the observed range of variation in nearby stars. The extent of habitable zones around these stars are estimated as a function of time. We find that significant changes in location and lifetime of habitable zones variations accompany abundance ration variations of this magnitude. For oxygen in particular the persistence time of most orbits that are at some point in the habitable zone is shortened by billions of years for high [O/Fe].
- Publication:
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American Astronomical Society Meeting Abstracts #219
- Pub Date:
- January 2012
- Bibcode:
- 2012AAS...21933903Y