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Title:
Variable Stars in the Fornax dSph Galaxy. II. Pulsating Stars below the Horizontal Branch
Authors:
Poretti, Ennio; Clementini, Gisella; Held, Enrico V.; Greco, Claudia; Mateo, Mario; Dell'Arciprete, Luca; Rizzi, Luca; Gullieuszik, Marco; Maio, Marcella
Affiliation:
AA(INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC), Italy.), AB(INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy.), AC(INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy.), AD(INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy.; Current address: Observatoire de Genève, 51 ch. des Maillettes, CH-1290 Versoix, Switzerland.), AE(Department of Astronomy, University of Michigan, 821 Dennison Building, Ann Arbor, MI 48109-1090.), AF(INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (LC), Italy.), AG(Joint Astronomy Centre, 660 N. A'ohoku Place, University Park, Hilo, HI 96720.), AH(INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy.), AI(INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna, Italy.)
Publication:
The Astrophysical Journal, Volume 685, Issue 2, pp. 947-957. (ApJ Homepage)
Publication Date:
10/2008
Origin:
UCP
ApJ Keywords:
Stars: Blue Stragglers, Stars: Variables: δ Scuti, Galaxies: Distances and Redshifts, Galaxies: Individual: Name: Fornax, Stars: Variables: Other, Techniques: Photometric
DOI:
10.1086/591241
Bibliographic Code:
2008ApJ...685..947P

Abstract

We have carried out an intensive survey of the northern region of the Fornax dwarf spheroidal galaxy with the aim of detecting the galaxy's short-period pulsating stars (P<0.25 days). Observations collected over three consecutive nights with the Wide Field Imager of the 2.2 m MPI telescope at ESO allowed us to detect 85 high-amplitude (0.20-1.00 mag in B light) variable stars with periods in the range from 0.046 to 0.126 days, similar to SX Phoenicis stars in Galactic metal-poor stellar populations. The plots of the observed periods vs. the B and V magnitudes show a dispersion largely exceeding the observational errors. To disentangle the matter, we separated the first-overtone from the fundamental-mode pulsators and tentatively identified a group of subluminous variables, about 0.35 mag fainter than the others. Their nature as either metal-poor intermediate-age stars or stars formed by the merging of close binary systems is discussed. The rich sample of the Fornax variables also led us to reconstruct the period-luminosity relation for short-period pulsating stars. An excellent linear fit, MV=-1.83(+/-0.08)-3.65(+/-0.07)logPF, was obtained using 153 δ Scuti and SX Phoenicis stars in a number of different stellar systems.

Based on observations collected at ESO, La Silla, Chile, Proposal 68.A-0281.

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