On the Reliability of Determining the Parameters of the Atmospheres of Field RR Lyrae Variables.

Published data from 25 papers published between 1995 and 2017 are used to find the effective temperatures and surface acceleration of gravity for 100 RR Lyrae variables in the galactic field with known chemical composition. The atmospheric parameters of almost half the stars in our list were determined in two or more papers. The mean-weighted values of the parameters are calculated for these stars. The values of Teff and logg for almost all the stars studied here lie within the theoretically calculated range where highly evolved stars turn out to be variable. The convergence of the various determinations of the corresponding parameters is analyzed. It is concluded that the values of the effective temperatures and acceleration of gravity for these RR Lyrae variables are highly reliable. [ABSTRACT FROM AUTHOR]