Astron. Astrophys. 326, 736-740 (1997)

Accuracy of effective temperatures of solar chemical composition stars derived from the flux fitting method

M.L. Malagnini ¹ and C. Morossi <sup>2

1</sup> Dipartimento di Astronomia, Università degli Studi di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy
² Osservatorio Astronomico di Trieste, Via G.B. Tiepolo, 11, I-34131 Trieste, Italy

Received 8 April 1997 / Accepted 20 May 1997

Abstract

We discuss the uncertainties affecting the determinations of effective temperature and apparent angular diameters based on the flux fitting method. We use Kurucz model fluxes and the spectrophotometric scans given in Breger Catalog. In particular, we analyze and discuss the influence of indetermination which may affect the fixed secondary parameters (i.e. surface gravity, overall metallicity, and interstellar reddening correction) on the estimates of the fitted parameters, and . The role of different sources of data for the same star and of each of the above mentioned parameters is described in detail for five representative stars, while 130 non-supergiant solar chemical composition stars, in the spectral range G8 - B0, are used to quantitatively illustrate the statistical behaviour of uncertainties.

Key words: stars: general atmospheres fundamental parameters

Send offprint requests to: M.L. Malagnini

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Contents

• 1. Introduction
• 2. Input data
  • 2.1. The observational database
  • 2.2. The theoretical database
• 3. Method of the analysis
  • 3.1. Reddening
  • 3.2. Metallicity
  • 3.3. Surface gravity
• 4. Results and discussion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1997

Online publication: October 15, 1997
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