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Open cluster characterization via cross-correlation with a spectral library†

Published online by Cambridge University Press:  18 January 2010

Francisco F. S. Maia ,
João F. C. Santos Jr. ,
Wagner J. B. Corradi  and
Andrés E. Piatti
Francisco F. S. Maia
Affiliation:
Universidade Federal de Minas Gerais, ICEx, Dept. de Física, Av. Antônio Carlos, 6627, Belo Horizonte 31270-901, MG, Brazil email: [email protected], [email protected], [email protected]
João F. C. Santos Jr.
Affiliation:
Universidade Federal de Minas Gerais, ICEx, Dept. de Física, Av. Antônio Carlos, 6627, Belo Horizonte 31270-901, MG, Brazil email: [email protected], [email protected], [email protected]
Wagner J. B. Corradi
Affiliation:
Universidade Federal de Minas Gerais, ICEx, Dept. de Física, Av. Antônio Carlos, 6627, Belo Horizonte 31270-901, MG, Brazil email: [email protected], [email protected], [email protected]
Andrés E. Piatti
Affiliation:
Instituto de Astronomía y Física del Espacio, CC67, Suc. 28, 1428 Buenos Aires, Argentina email: [email protected]
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Abstract

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We present a characterization method based on spectral cross-correlation to obtain the physical parameters of the controversial stellar aggregate ESO442–SC04. The data used was obtained with GMOS at the Gemini South telescope, and includes spectra of 17 stars in the central region of the object and 6 standard stars. fxcor was used iteratively to obtain self-consistent radial velocities for the standard stars and average radial velocities for the science spectra. Spectral types, effective temperatures, surface gravities and metallicities were determined using fxcor to correlate cluster spectra with the ELODIE spectral library and select the best correlation matches using the Tonry & Davis ratio. Analysis of the results suggests that the stars in ESO442–SC04 are not bound and, therefore, they do not constitute a physical system.

Keywords

open clusters and associations: generalopen clusters and associations: individual (ESO 442–SC04)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S266: Star clusters: basic galactic building blocks throughout time and space , August 2009 , pp. 458 - 461
Copyright
Copyright © International Astronomical Union 2010

References

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