Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-09-21
Astronomy and Astrophysics
Astrophysics
6 pages, LaTex using newpasp.sty (included). Proceedings of the IAU176 Colloquium, Budapest, Hungary, on "The Impact of Large
Scientific paper
We have applied the Baade-Wesselink method to two field RR Lyrae stars, i.e. SW And and RR Cet, and derived their distances and physical parameters. With respect to previous B-W analyses we have applied the following improvements: a) use of all sets of available data, after proper comparison for homogeneity and compatibility; b) use of the most recent and accurate model atmospheres, with turbulent velocity V(turb) = 4 km/s and the no-overshooting approximation, and comparison with other treatments of convection; c) use of the instantaneous gravity along the pulsation cycle rather than the mean value; d) comparison with modified radial velocity curves according to various assumptions on radial velocity gradients in the atmosphere; and e) careful reanalysis of the temperature scale. The main aim of this study is to evaluate the effect of the above items on the B-W results and verify whether any (or a combination) of them can possibly account for the discrepancy of the absolute magnitude zero-point with respect to other independent determinations.
Cacciari Carla
Castelli Fiorella
Clementini Gisella
Melandri Fabrizio
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