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Precise effective temperatures of solar analog stars

Published online by Cambridge University Press:  05 July 2012

D. Cornejo-Espinoza ,
I. Ramírez ,
P. S. Barklem  and
W. Guevara-Day
D. Cornejo-Espinoza
Affiliation:
Departamento de Astrofísica, Agencia Espacial del Perú, CONIDA
I. Ramírez
Affiliation:
McDonald Observatory and Department of Astronomy, University of Texas at Austin, USA
P. S. Barklem
Affiliation:
Departament of Physics and Astronomy, Uppsala University, Sweden
W. Guevara-Day
Affiliation:
Departamento de Astrofísica, Agencia Espacial del Perú, CONIDA
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Abstract

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We perform a study of 62 solar analog stars to compute their effective temperatures (Teff) using the Balmer line wing fitting procedure and compare them with Teff values obtained using other commonly employed methods. We use observed Hα spectral lines and a fine grid of theoretical LTE model spectra calculated with the best available atomic data and most recent quantum theory. Our spectroscopic data are of very high quality and have been carefully normalized to recover the proper shape of the Hα line profile. We obtain Teff values with internal errors of about 25K. Comparison of our results with those from other methods shows reasonably good agreement. Then, combining Teff values obtained from four independent techniques, we are able to determine final Teff values with errors of about 10K.

Keywords

Lines ProfilesStellar Atmospheres
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S286: Comparative Magnetic Minima: Characterizing quiet times in the Sun and Stars , October 2011 , pp. 328 - 331
Copyright
Copyright © International Astronomical Union 2012

References

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