Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-07-16
Astron.J.126:2015-2036,2003
Astronomy and Astrophysics
Astrophysics
52 pages (aastex 11pt, preprint style), including 17 figures and 13 tables; accepted for publication in AJ (scheduled for the
Scientific paper
10.1086/378366
We present atmospheric parameters and iron abundances derived from high-resolution spectra for three samples of dwarf stars: stars which are known to host close-in giant planets (CGP), stars for which radial velocity data exclude the presence of a close-in giant planetary companion (no-CGP), as well as a random sample of dwarfs with a spectral type and magnitude distribution similar to that of the planetary host stars (control). All stars have been observed with the same instrument and have been analyzed using the same model atmospheres, atomic data and equivalent width modeling program. Abundances have been derived differentially to the Sun, using a solar spectrum obtained with Callisto as the reflector with the same instrumentation. We find that the iron abundances of CGP dwarfs are on average by 0.22 dex greater than that of no-CGP dwarfs. The iron abundance distributions of both the CGP and no-CGP dwarfs are different than that of the control dwarfs, while the combined iron abundances have a distribution which is very similar to that of the control dwarfs. All four samples (CGP, no-CGP, combined, control) have different effective temperature distributions. We show that metal enrichment occurs only for CGP dwarfs with temperatures just below solar and approximately 300 K higher than solar, whereas the abundance difference is insignificant at Teff around 6000 K.
Heiter Ulrike
Luck Earle R.
No associations
LandOfFree
Abundance Analysis of Planetary Host Stars I. Differential Iron Abundances does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Abundance Analysis of Planetary Host Stars I. Differential Iron Abundances, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Abundance Analysis of Planetary Host Stars I. Differential Iron Abundances will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-206693