Journal Article

Fundamental parameters of RR Lyrae stars from multicolour photometry and Kurucz atmospheric models – I. Theory and practical implementation

S. Barcza

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 1, pages 486-492
Published in print July 2010 | ISSN: 0035-8711
Published online July 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16676.x
Fundamental parameters of RR Lyrae stars from multicolour photometry and Kurucz atmospheric models – I. Theory and practical implementation

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A photometric calibration of Kurucz static model atmospheres is used to obtain the following parameters of RR Lyrae stars: variation of stellar angular radius ϑ, effective temperature Te, gravity ge as a function of phase, interstellar reddening E(BV) towards the star and atmospheric metallicity M. Photometric and hydrodynamic conditions are given to find the phases of pulsation when the quasi-static atmosphere approximation (QSAA) can be applied. The QSAA is generalized to a non-uniformly moving spherical atmosphere, and the distance d, mass and atmospheric motion are derived from the laws of mass and momentum conservation. To demonstrate the efficiency of the method, the UBV(RI)C photometry of SU Dra was used to derive the following parameters: [M] =−1.60 ± 0.10 dex, , equilibrium luminosity Leq= 45.9 ± 9.3 L and Teq= 6813 ± 20 K.

Keywords: hydrodynamics; stars: atmospheres; stars: fundamental parameters; stars: individual: SU Dra; stars: oscillations; stars: variables: RR Lyrae

Journal Article.  5832 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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