SIMBAD references

2006ApJ...637.1102R - Astrophys. J., 637, 1102-1112 (2006/February-1)

The N2K consortium. V. Identifying very metal-rich stars with low-resolution spectra: finding planet-search targets.


Abstract (from CDS):

We present empirical calibrations that provide estimates of 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], Teff, and logg have been made using spectral-synthesis analysis of HIRES spectra, and (2) Lick indices have also been measured. Estimation of atmospheric parameters with low-resolution spectroscopy rather than photometry has the advantage of producing a highly accurate metallicity calibration, and requires only one observation per star. Our calibrations have identified a number of bright (V<9) metal-rich stars that 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. We have also investigated the possibility of constructing a ``planeticity'' calibration to predict the presence of planets based on stellar abundance ratios but find no evidence that a convincing relation of this type can be established. High metallicity remains the best single indicator that a given star is likely to harbor extrasolar planets.

Abstract Copyright:

Journal keyword(s): Methods: Statistical - Stars: Planetary Systems - Stars: Abundances

VizieR on-line data: <Available at CDS (J/ApJ/637/1102): table2.dat>

Simbad objects: 268

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