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New Algorithms to Calibrate the Strömgren Photometric System in Metal-to-Hydrogen Ratio

Published online by Cambridge University Press:  07 August 2017

V. Malyuto
V. Malyuto*
Affiliation:
Tartu Astrophysical Observatory, EE2444, Tõravere, Estonia

Extract

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The previous calibration of the Strömgren photometric indices in terms of spectroscopic [Fe/H] values was performed by Schuster and Nissen (1989) with the application to their sample of calibration stars a mathematical package handling the regression of [Fe/H] values against the (b – y), m1, and c1 indices, and their combinations. To provide a similar regression we applied a quite another independent statistical method (notably that of of stepwise linear regression) to the same sample and also to other available calibration samples of F stars. We conclude that in our case the quality of calibration was slightly better and the analytical form of calibration equation was much simpler.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 164: Stellar Populations , 1995 , pp. 365
Copyright
Copyright © Kluwer 1995 

References

Cayrel de Strobel, G., Hauck, B., Francois, P., Thevenin, F., Friel, E., Mermilliod, M., Borde, S. (1992) Catalogue of [Fe/H] determinations: 1991 edition, Astronomy and Astrophysics Supplement Series, Vol. no. 95, pp. 273–336 Google Scholar
Malyuto, V. (1993) Estimates of the accuracy of stellar physical parameteres from inter-comparison of catalogues, Astronomy and Astrophysics, Vol. no. 278, pp. 73–80 Google Scholar
Schuster, W., Nissen, P.E. (1989) uvby-β photometry of high-velocity and metal-poor stars, Astronomy and Astrophysics , Vol. no. 221, pp. 65–77 Google Scholar