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Recent Hipparcos results have lent support to the idea that RR Lyraevariables in the halo field and in globular clusters differ in luminosity by~0.2mag. In this Letter, we study the pulsation properties of RR Lyraes inclusters with distances determined via main-sequence fitting to Hipparcosparallaxes for field subdwarfs, and compare them with the properties of fieldvariables also analyzed with Hipparcos. We show that the period-temperaturedistributions for field and cluster variables are essentiallyindistinguishable, thus suggesting that there is no significant difference inluminosity between them.Comment: 11 pages, including three embedded figures and one table. ApJ  (Letters), in pres

Is There a Difference in Luminosity between Field and Cluster RR Lyrae Variables?