The Absolute Magnitude of RR Lyrae Stars Derived from the Hipparcos Catalogue

Details The Absolute Magnitude of RR Lyrae Stars Derived from the Hipparcos Catalogue The Absolute Magnitude of RR Lyrae Stars Derived from the Hipparcos Catalogue

1997-11-04

arxiv.org/abs/astro-ph/9711021v1

Astronomy and Astrophysics

Astrophysics

6 pages LaTex, 1 PostScript figure, to appear in ApJ Lett

Scientific paper

10.1086/311084

The present determination of the absolute magnitude $M_V(RR)$ of RR Lyrae stars is twofold, relying upon Hipparcos proper motions and trigonometric parallaxes separately. First, applying the statistical parallax method to the proper motions, we find $=0.69\pm0.10$ for 99 halo RR Lyraes with $<$[Fe/H]$>$ =--1.58. Second, applying the Lutz-Kelker correction to the RR Lyrae HIP95497 with the most accurately measured parallax, we obtain $M_V(RR)$=(0.58--0.68)$^{+0.28}_{-0.31}$ at [Fe/H]=--1.6. Furthermore, allowing full use of low accuracy and negative parallaxes as well for 125 RR Lyraes with -- 2.49$\leq$[Fe/H]$\leq$0.07, the maximum likelihood estimation yields the relation, $M_V(RR)$=(0.59$\pm$0.37)+(0.20$\pm$0.63)([Fe/H]+1.60), which formally agrees with the recent preferred relation. The same estimation yields again $$ = $0.65\pm0.33$ for the 99 halo RR Lyraes. Although the formal errors in the latter three parallax estimates are rather large, all of the four results suggest the fainter absolute magnitude, $M_V(RR)$$\approx$0.6--0.7 at [Fe/H]=--1.6. The present results still provide the lower limit on the age of the universe which is inconsistent with a flat, matter-dominated universe and current estimates of the Hubble constant.

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