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Title:
Pulsating Variable Stars in the Coma Berenices Dwarf Spheroidal Galaxy
Authors:
Musella, Ilaria; Ripepi, Vincenzo; Clementini, Gisella; Dall'Ora, Massimo; Kinemuchi, Karen; Fabrizio, Luca Di; Greco, Claudia; Marconi, Marcella; Smith, Horace A.; Radovich, Mario; Beers, Timothy C.
Affiliation:
AA(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AB(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AC(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ), AD(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AE(Universidad de Concepción, Departamento de Física, Concepción, Chile ; University of Florida, Department of Astronomy, Gainesville, FL 32611-2055, USA ; ), AF(INAF, Centro Galileo Galilei & Telescopio Nazionale Galileo, S. Cruz de La Palma, Spain ), AG(Observatoire de Geneve, Sauverny, Switzerland ), AH(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AI(Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA ), AJ(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AK(Department of Physics and Astronomy, CSCE, Center for the Study of Cosmic Evolution, and JINA, Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA )
Publication:
The Astrophysical Journal Letters, Volume 695, Issue 1, pp. L83-L87 (2009). (ApJL Homepage)
Publication Date:
04/2009
Origin:
IOP
ApJ Keywords:
galaxies: distances and redshifts, galaxies: dwarf, galaxies: individual: Coma, stars: horizontal-branch, stars: variables: other, techniques: photometric
DOI:
10.1088/0004-637X/695/1/L83
Bibliographic Code:
2009ApJ...695L..83M

Abstract

We present B, V, I time-series photometry of the Coma Berenices dwarf spheroidal galaxy, a faint Milky Way (MW) satellite, recently discovered by the Sloan Digital Sky Survey. We have obtained V, B - V and V, V - I color-magnitude diagrams that reach V ~ 23.0-23.2 mag showing the galaxy turnoff at V ~ 21.7 mag, and have performed the first study of the variable star population of this new MW companion. Two RR Lyrae stars (a fundamental-mode, RRab, and a first overtone, RRc, pulsator) and a short period variable with period P = 0.12468 days were identified in the galaxy. The RRab star has a rather long period of P ab = 0.66971 days and is about 0.2 mag brighter than the RRc variable and other nonvariable stars on the galaxy horizontal branch (HB). In the period-amplitude diagram, the RRab variable falls closer to the loci of Oosterhoff type-II systems and evolved fundamental-mode RR Lyrae stars in the Galactic globular cluster M3. The average apparent magnitude of the galaxy HB, langV HBrang = 18.64 ± 0.04 mag, leads to a distance modulus for the Coma dSph μ0 = 18.13 ± 0.08 mag, corresponding to a distance d = 42+2 -1 kpc, by adopting a reddening E(B - V) = 0.045 ± 0.015 mag and a metallicity [Fe/H] =-2.53 ± 0.05 dex.

Based on data collected at the 1.52 m telescope of the INAF-Osservatorio Astronomico di Bologna, Loiano, Italy, at the 2.3 m telescope at the Wyoming Infrared Observatory (WIRO) at Mt. Jelm, Wyoming, USA, and at 2.5 m Isaac Newton Telescope, La Palma, Canary Island, Spain.

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