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U. Heiter, R.E. Luck (CWRU)
We present atmospheric parameters and abundances derived for the majority of dwarf stars (north of -30 degrees declination) which are up to now known to host extrasolar planets. High-resolution spectra have been obtained with the Sandiford Echelle spectrograph on the 2.1m telescope at the University of Texas McDonald Observatory. We have used the same model atmospheres, atomic data and equivalent width modeling program for the analysis of all stars. Abundances have been derived differentially to the Sun, using a solar spectrum obtained with Callisto as the reflector with the same instrumentation. A similar analysis has been performed for a sample of stars for which radial velocity data exclude the presence of a close-in giant planetary companion, as well as a random sample of dwarfs with a spectral type and magnitude distribution similar to that of the planetary host stars. The results are compared to recent studies found in the literature.
In addition, we have derived a new spectroscopic temperature calibration for late F to early K dwarfs using the observed line-depth ratios and the effective temperatures of our program stars.
This research has been supported by an NSF grant.
The author(s) of this abstract have provided an email address for comments about the abstract: uxh3@po.cwru.edu
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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.