In a recent paper, Fernley et al. (1997) have studied the absolute magnitude of RR Lyrae stars by using a statistical-parallax algorithm developed by Hawley et al. (1986). This method has been introduced as an improvement over earlier algorithms such as:
The CJD and RJH algorithms have already been confronted on synthetic data (Jones et al. 1980) and, notwithstanding their different formulations, both gave the correct solution.
The publication of an exhaustive sample of data (including Hipparcos proper motions) for RR Lyrae stars by Fernley et al. (1997) made it interesting to test on it the RJH algorithm and to compare the results with those obtained with the algorithm by Hawley et al. (1986).
© European Southern Observatory (ESO) 1998
Online publication: March 30, 1998