Open Cluster Characterization via Cross-Correlation with Spectral Library

MAIA, F.F.S.; SANTOS JR, JOÂO F.C.; CORRADI, W.J.B.; PIATTI, ANDRÉS E.

Proc. IAU Symp. "Star Clusters - Basic Galactic Building Blocks throughout Time and Space"

Cambridge Univ Press

Año: 2010 vol. 266 p. 458 - 461

1743–9213

Abstract. We present a characterization method based on spectral cross-correlation to obtainthe physical parameters of the controversial stellar aggregate ESO442-SC04. The data usedwas obtained with GMOS at Gemini-South telescope including 17 stars in the central regionof the object and 6 standard-stars. fxcor was used in an iterative process to obtain self-consistent radial velocities for the standard-stars and averaged radial velocities for the sciencespectra. Spectral types, effective temperature, suface gravity and metallicities parameters weredetermined using fxcor to correlate cluster spectra with ELODIE spectral library and selectingthe best correlation matches using the Tonry and Davis Ratio (TDR). Analysis of the resultssuggests that the stars in ESO442-SC04 are not bound and therefore they do not constitute aphysical system.