Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Electronic Refereed Journal Article (HTML)
· Full Refereed Journal Article (PDF/Postscript)
· arXiv e-print (arXiv:0909.3303)
· On-line Data
· References in the article
· Citations to the Article (2) (Citation History)
· Refereed Citations to the Article
· SIMBAD Objects (13)
· Also-Read Articles (Reads History)
·
· Translate This Page
Title:
The Variable Star Population of the Globular Cluster B514 in the Andromeda Galaxy
Authors:
Clementini, Gisella; Contreras, Rodrigo; Federici, Luciana; Cacciari, Carla; Merighi, Roberto; Smith, Horace A.; Catelan, Márcio; Fusi Pecci, Flavio; Marconi, Marcella; Kinemuchi, Karen; Pritzl, Barton J.
Affiliation:
AA(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ), AB(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ; Dipartimento di Astronomia, Università di Bologna, Bologna, Italy ; ), AC(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ), AD(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ), AE(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ), AF(Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA ), AG(Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Santiago, Chile ; John Simon Guggenheim Memorial Foundation Fellow.; ), AH(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ), AI(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AJ(Universidad de Concepción, Departamento de Astronomía, Concepción, Chile ; Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA ), AK(Department of Physics and Astronomy, University of Wisconsin Oshkosh, Oshkosh, WI 54901, USA )
Publication:
The Astrophysical Journal Letters, Volume 704, Issue 2, pp. L103-L107 (2009). (ApJL Homepage)
Publication Date:
10/2009
Origin:
IOP
ApJ Keywords:
galaxies: individual: M31, globular clusters: individual: B514, stars: distances, stars: variables: other, techniques: photometric
DOI:
10.1088/0004-637X/704/2/L103
Bibliographic Code:
2009ApJ...704L.103C

Abstract

A rich harvest of RR Lyrae stars has been identified for the first time in B514, a metal-poor ([Fe/H] ~- 1.95 ± 0.10 dex) globular cluster (GC) of the Andromeda galaxy (M31), based on Hubble Space Telescope Wide Field Planetary Camera 2 and Advanced Camera for Surveys time-series observations. We have detected and derived periods for 89 RR Lyrae stars (82 fundamental-mode, RRab, and 7 first-overtone, RRc, pulsators, respectively) among 161 candidate variables identified in the cluster. The average period of the RR Lyrae variables (langPabrang = 0.58 days and langPcrang = 0.35 days, for RRab and RRc pulsators, respectively) and the position in the period-amplitude diagram both suggest that B514 is likely an Oosterhoff type I cluster. This appears to be in disagreement with the general behavior of the metal-poor GCs in the Milky Way, which show instead Oosterhoff type II pulsation properties. The average apparent magnitude of the RR Lyrae stars sets the mean level of the cluster horizontal branch at langV(RR)rang = 25.18 ± 0.02 (σ = 0.16 mag, on 81 stars). By adopting a reddening E(B - V) = 0.07 ± 0.02 mag, the above metallicity and M V = 0.44 ± 0.05 mag for the RR Lyrae variables of this metallicity, we derive a distance modulus of μ0 = 24.52 ± 0.08 mag, corresponding to a distance of about 800 ± 30 kpc, based on a value of M V that sets μ0(LMC)=18.52 mag.

Based on data collected with the Wide Field Planetary Camera 2 onboard the Hubble Space Telescope (HST) and Advanced Camera for Surveys HST archive data.

Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints