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Title:
The Leo IV Dwarf Spheroidal Galaxy: Color-Magnitude Diagram and Pulsating Stars
Authors:
Moretti, Maria Ida; Dall'Ora, Massimo; Ripepi, Vincenzo; Clementini, Gisella; Di Fabrizio, Luca; Smith, Horace A.; DeLee, Nathan; Kuehn, Charles; Catelan, Márcio; Marconi, Marcella; Musella, Ilaria; Beers, Timothy C.; Kinemuchi, Karen
Affiliation:
AA(Dipartimento di Astronomia, Università di Bologna, Bologna, Italy ), AB(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AC(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AD(INAF, Osservatorio Astronomico di Bologna, Bologna, Italy ), AE(INAF, Centro Galileo Galilei & Telescopio Nazionale Galileo, S. Cruz de La Palma, Spain ), AF(Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA ), AG(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA ), AH(Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA ), AI(Pontificia Universidad Católica de Chile, Departamento de Astronomía y Astrofísica, Santiago, Chile ; On sabbatical leave at Michigan State University, Department of Physics and Astronomy, 3215 Biomedical and Physical Sciences Bldg., East Lansing, MI 48824, USA. ; John Simon Guggenheim Memorial Foundation Fellow.; ), AJ(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AK(INAF, Osservatorio Astronomico di Capodimonte, Napoli, Italy ), AL(Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320, USA ; Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA ), AM(Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA ; Universidad de Concepción, Departamento de Física, Concepción, Chile )
Publication:
The Astrophysical Journal Letters, Volume 699, Issue 2, pp. L125-L129 (2009). (ApJL Homepage)
Publication Date:
07/2009
Origin:
IOP
ApJ Keywords:
galaxies: dwarf, galaxies: individual: Leo IV, stars: distances, stars: variables: other, techniques: photometric
DOI:
10.1088/0004-637X/699/2/L125
Bibliographic Code:
2009ApJ...699L.125M

Abstract

We present the first V, B - V color-magnitude diagram of the Leo IV dwarf spheroidal galaxy, a faint Milky Way satellite recently discovered by the Sloan Digital Sky Survey. We have obtained B, V time-series photometry reaching about half a magnitude below the Leo IV turnoff, which we detect at V = 24.7 mag, and have performed the first study of the variable star population. We have identified three RR Lyrae stars (all fundamental-mode pulsators, RRab) and one SX Phoenicis variable in the galaxy. In the period-amplitude diagram the Leo IV RR Lyrae stars are located close to the loci of Oosterhoff type I systems and the evolved fundamental-mode RR Lyrae stars in the Galactic globular cluster M3. However, their mean pulsation period, langPabrang = 0.655 days, would suggest an Oosterhoff type II classification for this galaxy. The RR Lyrae stars trace very well the galaxy's horizontal branch, setting its average magnitude at langV RRrang = 21.48 ± 0.03 mag (standard deviation of the mean). This leads to a distance modulus of μ0 = 20.94 ± 0.07 mag, corresponding to a distance of 154 ± 5 kpc, by adopting for the Leo IV dSph a reddening E(B - V) = 0.04 ± 0.01 mag and a metallicity of [Fe/H] = -2.31 ± 0.10.

Based on data collected at the 2.5 m Isaac Newton Telescope, La Palma, Canary Island, Spain, at the 4.2 m William Herschel Telescope, Roche de los Muchachos, Canary Islands, Spain, and at the 4.1 m Southern Astrophysical Research Telescope, Cerro Pachón, Chile.

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