Abstract
Abstract We present basic stellar parameters of 99 late-type G giants based on high-resolution spectra obtained by the High Dispersion Spectrograph attached to Subaru Telescope. These stars are targets of a Doppler survey program searching for extra-solar planets among evolved stars, with a metallicity of $-$0.8 $\lt$ [Fe$/$H] $\lt$$+$0.2. We also derived their abundances of 15 chemical elements, including four $\alpha $-elements (Mg, Si, Ca, Ti), three odd-Z light elements (Al, K, Sc), four iron peak elements (V, Cr, Fe, Ni), and four neutron-capture elements (Y, Ba, La, Eu). Kinematic properties reveal that most of the program stars belong to the thin disk.
Highlights
Since the first extra-solar planet around main sequence star, 51 Peg b was discovered in 1995 (Mayor & Queloz 1995), more than 500 planets have been revealed in solar neighbourhood 1, providing clues on planet formation process around different types of stars
One way to search for extra-solar planets around intermediate-mass stars is monitoring radial velocities of late-type G, K giants
In this paper we present the first results of stellar parameters and chemical abundances for 99 giants based on high resolution spectra obtained with Subaru Telescope
Summary
Since the first extra-solar planet around main sequence star, 51 Peg b was discovered in 1995 (Mayor & Queloz 1995), more than 500 planets have been revealed in solar neighbourhood 1, providing clues on planet formation process around different types of stars. One way to search for extra-solar planets around intermediate-mass stars is monitoring radial velocities of late-type G, K giants. Their spectra have many sharp absorption lines, and suitable for getting precise radial velocity data by modern Doppler techniques (e.g. Butler et al 1996). As an extension of EAPSNet, the Subaru Planets Search Program started monitoring radial velocity variations of about 300 late-type G, K giants in 2006. In this paper we present the first results of stellar parameters and chemical abundances for 99 giants based on high resolution spectra obtained with Subaru Telescope.
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