Is There a Difference in Luminosity between Field and Cluster RR Lyrae Variables?
Astrophysics
2011-02-11 v1
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/9801064,
title = {Is There a Difference in Luminosity between Field and Cluster RR Lyrae Variables?},
author = {M. Catelan},
journal= {arXiv preprint arXiv:astro-ph/9801064},
year = {2011}
}
Comments
11 pages, including three embedded figures and one table. ApJ (Letters), in press