Red giants from the Pennsylvania - Torun Planet Search

Details Red giants from the Pennsylvania - Torun Planet Search Red giants from the Pennsylvania - Torun Planet Search

2010-02-12

arxiv.org/abs/1002.2627v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

3 pages, 2 figures, proceeding of the conference "New Technologies for Probing the Diversity of Brown Dwarfs and Exoplanets" (

Scientific paper

The main goal of the Pennsylvania - Torun Planet Search (PTPS) is detection and characterization of planets around evolved stars using the high-accuracy radial velocity (RV) technique. The project is performed with the 9.2 m Hobby-Eberly Telescope. To determine stellar parameters and evolutionary status for targets observed within the survey complete spectral analysis of all objects is required. In this paper we present the atmospheric parameters (effective temperatures, surface gravities, microturbulent velocities and metallicities) of a subsample of Red Giant Clump stars using strictly spectroscopic methods based on analysis of equivalent widths of Fe I and Fe II lines. It is shown that our spectroscopic approach brings reliable and consistent results.

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