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Title:
Variable Stars in the Newly Discovered Milky Way Satellite in Bootes
Authors:
Dall'Ora, Massimo; Clementini, Gisella; Kinemuchi, Karen; Ripepi, Vincenzo; Marconi, Marcella; Di Fabrizio, Luca; Greco, Claudia; Rodgers, Christopher T.; Kuehn, Charles; Smith, Horace A.
Affiliation:
AA(INAF, Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131 Napoli, Italy; , , .), AB(INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy; , .), AC(University of Wyoming, Department of Physics and Astronomy, Department 3905, Laramie, WY 82071; , .), AD(INAF, Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131 Napoli, Italy; , , .), AE(INAF, Osservatorio Astronomico di Capodimonte, via Moiariello 16, I-80131 Napoli, Italy; , , .), AF(INAF, Centro Galileo Galilei and Telescopio Nazionale Galileo, P.O. Box 565, 38700 Santa Cruz de La Palma, Spain; .), AG(INAF, Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna, Italy; , .), AH(University of Wyoming, Department of Physics and Astronomy, Department 3905, Laramie, WY 82071; , .), AI(Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320 , .), AJ(Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320 , .)
Publication:
The Astrophysical Journal, Volume 653, Issue 2, pp. L109-L112. (ApJL Homepage)
Publication Date:
12/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Distances and Redshifts, Galaxies: Dwarf, galaxies: individual (Bootes), Stars: Horizontal-Branch, Stars: Variables: Other, Techniques: Photometric
DOI:
10.1086/510665
Bibliographic Code:
2006ApJ...653L.109D

Abstract

We present V, I light curves for 12 variable stars identified in the newly discovered satellite of the Milky Way in the Bootes constellation. Our sample includes 11 RR Lyrae stars (five first overtone, five fundamental mode, and one double-mode pulsator) and one long-period variable close to the galaxy red giant branch tip. The RR Lyrae stars trace very well the average V luminosity of the galaxy horizontal branch, leading to a true distance modulus for the galaxy of μ0=19.11+/-0.08 mag for an assumed metal abundance of [Fe/H]=-2.5 and for E(B-V)=0.02 mag. Average periods are <Pab>=0.69 days and <Pc>=0.37 days for ab- and c-type RR Lyrae stars, respectively, making Bootes the second pure Oosterhoff type II (OoII) dSph after Ursa Minor. The location of the double-mode RR Lyrae (RRd) in the Petersen diagram is consistent with RRd stars in OoII clusters and corresponds to an intrinsic luminosity of logL/logLsolar=1.72 (for Z=10-4 and M=0.80 Msolar) according to nonlinear convective pulsation models.

Based on data collected at the 1.52 m telescope of the INAF-Osservatorio Astronomico di Bologna, Loiano, Italy, at the INAF-Telescopio Nazionale Galileo, La Palma, Canary Islands, and at the 2.3 m telescope at the Wyoming Infrared Observatory (WIRO) at Mount Jelm, WY.

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