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Title: THE IMPACT OF CONTAMINATED RR LYRAE/GLOBULAR CLUSTER PHOTOMETRY ON THE DISTANCE SCALE

Abstract

RR Lyrae variables and the stellar constituents of globular clusters are employed to establish the cosmic distance scale and age of the universe. However, photometry for RR Lyrae variables in the globular clusters M3, M15, M54, M92, NGC 2419, and NGC 6441 exhibit a dependence on the clustercentric distance. For example, variables and stars positioned near the crowded high-surface brightness cores of the clusters may suffer from photometric contamination, which invariably affects a suite of inferred parameters (e.g., distance, color excess, absolute magnitude, etc.). The impetus for this study is to mitigate the propagation of systematic uncertainties by increasing awareness of the pernicious impact of contaminated and radial-dependent photometry.

Authors:
; ;  [1];  [2]
  1. Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3 (Canada)
  2. Departamento de Astronomia, Universidad de Concepcion, Casilla 160-C, CL Concepcion (Chile)
Publication Date:
OSTI Identifier:
22047764
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 752; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BRIGHTNESS; COLOR; DIAGRAMS; DISTANCE; PHOTOMETRY; STAR CLUSTERS; SURFACES; UNIVERSE; VARIABLE STARS

Citation Formats

Majaess, D., Turner, D., Lane, D., and Gieren, W., E-mail: dmajaess@ap.smu.ca. THE IMPACT OF CONTAMINATED RR LYRAE/GLOBULAR CLUSTER PHOTOMETRY ON THE DISTANCE SCALE. United States: N. p., 2012. Web. doi:10.1088/2041-8205/752/1/L10.
Majaess, D., Turner, D., Lane, D., & Gieren, W., E-mail: dmajaess@ap.smu.ca. THE IMPACT OF CONTAMINATED RR LYRAE/GLOBULAR CLUSTER PHOTOMETRY ON THE DISTANCE SCALE. United States. doi:10.1088/2041-8205/752/1/L10.
Majaess, D., Turner, D., Lane, D., and Gieren, W., E-mail: dmajaess@ap.smu.ca. Sun . "THE IMPACT OF CONTAMINATED RR LYRAE/GLOBULAR CLUSTER PHOTOMETRY ON THE DISTANCE SCALE". United States. doi:10.1088/2041-8205/752/1/L10.
@article{osti_22047764,
title = {THE IMPACT OF CONTAMINATED RR LYRAE/GLOBULAR CLUSTER PHOTOMETRY ON THE DISTANCE SCALE},
author = {Majaess, D. and Turner, D. and Lane, D. and Gieren, W., E-mail: dmajaess@ap.smu.ca},
abstractNote = {RR Lyrae variables and the stellar constituents of globular clusters are employed to establish the cosmic distance scale and age of the universe. However, photometry for RR Lyrae variables in the globular clusters M3, M15, M54, M92, NGC 2419, and NGC 6441 exhibit a dependence on the clustercentric distance. For example, variables and stars positioned near the crowded high-surface brightness cores of the clusters may suffer from photometric contamination, which invariably affects a suite of inferred parameters (e.g., distance, color excess, absolute magnitude, etc.). The impetus for this study is to mitigate the propagation of systematic uncertainties by increasing awareness of the pernicious impact of contaminated and radial-dependent photometry.},
doi = {10.1088/2041-8205/752/1/L10},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 752,
place = {United States},
year = {2012},
month = {6}
}