Abundances in Stars with Planets
Abstract
High S/N ratio (350-600) and high resolution (R=90,000) spectral data covering the wavelength region 4200 - 8800 Å were obtained for 12 planet-harboring stars with the SUBARU/HDS. Detailed abundance analyses have been carried out for these stars using the solar spectrum as a reference. Atmospheric parameters (Teff, log{g} microturbulent velocity ξt, and [Fe/H]) were determined spectroscopically using selected FeI, FeII lines. Abundance of 25 other elements have been determined relative to the Sun in a strictly differential manner. We find that both volatile and refractory elements behave similarly in these stars and could not confirm any significant dependence on the condensation temperature. All of the observed elements in planet-harboring stars show a similar trend in [X/Fe] vs [Fe/H] diagrams as normal disk stars.
We thus conclude that these 12 planet-harboring stars are quite "normal" (i.e., essentially indistinguishable from usual solar-type disk stars) from the viewpoint of their surface chemical abundances, in the sense that the spread in their metallicities results from the ordinary Galactic chemical evolution, without being related to any special mechanism (e.g., accretion of solid planetesimals) involved with the existence of planets.- Publication:
-
8th Asian-Pacific Regional Meeting, Volume II
- Pub Date:
- 2002
- Bibcode:
- 2002aprm.conf...57O