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

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

1998-01-08

arxiv.org/abs/astro-ph/9801064v1

Astrophys.J.495:L81-L84,1998

Astronomy and Astrophysics

Astrophysics

11 pages, including three embedded figures and one table. ApJ (Letters), in press

Scientific paper

10.1086/311227

Recent Hipparcos results have lent support to the idea that RR Lyrae variables 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 in clusters with distances determined via main-sequence fitting to Hipparcos parallaxes for field subdwarfs, and compare them with the properties of field variables also analyzed with Hipparcos. We show that the period-temperature distributions for field and cluster variables are essentially indistinguishable, thus suggesting that there is no significant difference in luminosity between them.

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