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Identifying Very Metal-Rich Stars with Low-Resolution Spectra: Finding Planet-Search Targets | | Sarah E. Robinson
; Jay Strader
; S. Mark Ammons
; Gregory Laughlin
; Debra Fischer
; | | Date: |
5 Oct 2005 | | Subject: | astro-ph | | Affiliation: | UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California at Santa Cruz, Department of Physics and Astronomy, San Francisco State University | | Abstract: | We present empirical calibrations that estimate stellar metallicity, effective temperature and surface gravity as a function of Lick/IDS indices. These calibrations have been derived from a training set of 261 stars for which (1) high-precision measurements of [Fe/H], T_eff and log g have been made using spectral-synthesis analysis of HIRES spectra, and (2) Lick indices have also been measured. Our [Fe/H] calibration, which has precision 0.07 dex, has identified a number of bright (V < 9) metal-rich stars which are now being screened for hot Jupiter-type planets. Using the Yonsei-Yale stellar models, we show that the calibrations provide distance estimates accurate to 20% for nearby stars. This paper outlines the second tier of the screening of planet-search targets by the N2K Consortium, a project designed to identify the stars most likely to harbor extrasolar planets. Discoveries by the N2K Consortium include the transiting hot Saturn HD 149026 b (Sato et al. 2005, astro-ph/0507009) and HD 88133 b (Fischer et al. 2005). See Ammons et al. (2005, In Press) for a description of the first tier of N2K metallicity screening, calibrations using broadband photometry. | | Source: | arXiv, astro-ph/0510150 | | Services: | Forum | Review | PDF | Favorites | |
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