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Title:
The Variable Stars of the Draco Dwarf Spheroidal Galaxy: Revisited
Authors:
Kinemuchi, K.; Harris, H. C.; Smith, Horace A.; Silbermann, N. A.; Snyder, L. A.; La Cluyzé, A. P.; Clark, C. L.
Affiliation:
AA(Departamento de Astronomía, Universidad de Concepción, Concepción, Chile ; Department of Astronomy, University of Florida, Gainesville, Fl 32611, USA ), AB(US Naval Observatory, Flagstaff Station, Flagstaff, AZ 86001, USA ), AC(Department of Physics & Astronomy, Michigan State University, East Lansing, MI 48824, USA ), AD( Spitzer Science Center, Mail Stop 220-6, Pasadena, CA 91125, USA), AE(Department of Physics & Astronomy, Michigan State University, East Lansing, MI 48824, USA ), AF(Department of Physics & Astronomy, Michigan State University, East Lansing, MI 48824, USA ), AG(Department of Physics & Astronomy, Michigan State University, East Lansing, MI 48824, USA )
Publication:
The Astronomical Journal, Volume 136, Issue 5, pp. 1921-1939 (2008). (AJ Homepage)
Publication Date:
11/2008
Origin:
IOP
AJ Keywords:
galaxies: dwarf, stars: RR Lyrae, stars: variables: other
DOI:
10.1088/0004-6256/136/5/1921
Bibliographic Code:
2008AJ....136.1921K

Abstract

We present a CCD survey of variable stars in the Draco dwarf spheroidal galaxy. This survey, which has the largest areal coverage since the original variable star survey by Baade & Swope, includes photometry for 270 RR Lyrae (RRL) stars, 9 anomalous Cepheids (ACs), 2 eclipsing binaries, and 12 slow, irregular red variables, as well as 30 background QSOs. Twenty-six probable double-mode RRL stars were identified. Observed parameters, including mean V and I magnitudes, V amplitudes, and periods, have been derived. Photometric metallicities of the ab-type RRL stars were calculated according to the method of Jurcsik & Kovacs, yielding a mean metallicity of lang[Fe/H]rang = -2.19 ± 0.03. The well-known Oosterhoff intermediate nature of the RRL stars in Draco is reconfirmed, although the double-mode RRL stars, with one exception, have properties similar to those found in Oosterhoff type II globular clusters. The period-luminosity relation of the ACs is rediscussed with the addition of the new Draco ACs.
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