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

M. Catelan | Zendy

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

Author(s) -

M. Catelan

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311227

Subject(s) - rr lyrae variable , globular cluster , astrophysics , physics , luminosity , halo , cluster (spacecraft) , field (mathematics) , instability strip , astronomy , mathematics , cepheid variable , galaxy , stars , computer science , pure mathematics , programming language

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

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