The Variable Stars of the Draco Dwarf Spheroidal Galaxy - Revisited

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 stars, 9 anomalous Cepheids, 2 eclipsing binaries, and 12 slow, irregular red variables, as well as 30 background QSOs. Twenty-six probable double-mode RR Lyrae stars were identified. Observed parameters, including mean V and I magnitudes, V amplitudes, and periods, have been derived. Photometric metallicities of the ab-type RR Lyrae stars were calculated according to the method of Jurcsik & Kovacs, yielding a mean metallicity of <[Fe/H]> = -2.19 +/- 0.03. The well known Oosterhoff intermediate nature of the RR Lyrae stars in Draco is reconfirmed, although the double-mode RR Lyrae stars with one exception have properties similar to those found in Oosterhoff type II globular clusters. The period-luminosity relation of the anomalous Cepheids is rediscussed with the addition of the new Draco anomalous Cepheids.

arXiv commentAccepted to AJ. 61 pages, 14 figures, 10 tables

References in corpus (20)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Abundance Patterns in the Draco, Sextans and Ursa Minor Dwarf Spheroidal Galaxies
• Variable Stars in Galactic Globular Clusters
• The Sloan Digital Sky Survey Quasar Catalog III. Third Data Release
• A Comparison of Elemental Abundance Ratios in Globular Clusters, Field Stars, and Dwarf Spheroidal Galaxies
• A multi-color and Fourier study of RR Lyrae variables in the globular cluster NGC 5272 (M3)
• The Draco and Ursa Minor dwarf spheroidals. A comparative study
• The Star Formation History and the Morphological Evolution of the Draco Dwarf Spheroidal Galaxy
• Globular Cluster Distances from RR Lyrae Stars
• Variable Stars in the Unusual, Metal-Rich Globular Cluster NGC 6388
• Analysis of RR Lyrae Stars in the Northern Sky Variability Survey
• The blue plume population in dwarf spheroidal galaxies: genuine blue stragglers or young stellar population?
• The RR Lyrae Distance to the Draco Dwarf Spheroidal Galaxy
• The Globular Cluster Omega Centauri and the Oosterhoff Dichotomy
• The Dwarf Spheroidal Companions to M31: Variable Stars in Andromeda VI
• The RR Lyrae Period-Amplitude Relation as a Clue to the Origin of the Oosterhoff Dichotomy
• Faint High Latitude Carbon Stars Discovered by the Sloan Digital Sky Survey: Methods and Initial Results
• The Carina Project: I. Bright Variable Stars
• The usage of Stromgren photometry in studies of Local Group Dwarf Spheroidal Galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients
• The Nature of the Red Giant Branches in the Ursa Minor and Draco Dwarf Spheroidal Galaxies

Cited by in corpus (53)

• Gaia DR2 Proper Motions of Dwarf Galaxies within 420 kpc: Orbits, Milky Way Mass, Tidal Influences, Planar Alignments, and Group Infall
• The Orbital Histories of Magellanic Satellites Using Gaia DR2 Proper Motions
• Machine-Learned Identification of RR Lyrae Stars from Sparse, Multi-band Data: the PS1 Sample
• A re-classification of Cepheids in the Gaia Data Release 2
• The ACS LCID Project. I. Short-Period Variables in the Isolated Dwarf Spheroidal Galaxies Cetus & Tucana
• Gaia DR3: Specific processing and validation of all-sky RR Lyrae and Cepheid stars -- The Cepheid sample
• Innocent Bystanders: Carbon Stars from the Sloan Digital Sky Survey
• La Silla QUEST RR Lyrae Star Survey: Region I
• The mass of our Galaxy from satellite proper motions in the Gaia era
• Finding, characterizing and classifying variable sources in multi-epoch sky surveys: QSOs and RR Lyrae in PS1 3$\pi$ data
• On the use of field RR Lyrae as Galactic probes: I. The Oosterhoff dichotomy based on fundamental variables
• Luminosity Functions and Host-to-Host Scatter of Dwarf Satellite Systems in the Local Volume
• Search for RR Lyrae stars in DES ultra-faint systems: Grus I, Kim 2, Phoenix II, and Grus II
• Andromeda XXIX: A New Dwarf Spheroidal Galaxy 200kpc from Andromeda
• Anomalous Cepheids in the Large Magellanic Cloud: Insight into their origin and connection with the star formation history
• Evidence for Galactic disc RR~Lyrae stars in the Solar neighbourhood
• Unmixing the Galactic Halo with RR Lyrae tagging
• The ISLAnds Project III: Variable Stars in Six Andromeda Dwarf Spheroidal Galaxies
• Proper Motion of the Leo II Dwarf Galaxy Based On Hubble Space Telescope Imaging
• Toward an internally consistent astronomical distance scale
• The ISLANDS project I: Andromeda XVI, An Extremely Low Mass Galaxy not Quenched by Reionization
• Charting Unexplored Dwarf Galaxy Territory With RR Lyrae
• A DECam View of the Diffuse Dwarf Galaxy Crater II: Variable Stars
• A Comprehensive, Wide-Field Study of Pulsating Stars in the Carina Dwarf Spheroidal Galaxy
• Proper Motion of the Draco Dwarf Galaxy Based On Hubble Space Telescope Imaging
• RR Lyrae-based Distances for 39 Nearby Dwarf Galaxies Calibrated to Gaia eDR3
• Study of Globular Cluster M53: new variables, distance, metallicity
• The Carina Project. VI. The helium burning variable stars
• A fresh look at the RR Lyrae population in the Draco dwarf spheroidal galaxy with Gaia
• Stellar proper motions in the outskirts of classical dwarf spheroidal galaxies with Gaia EDR3
• Homogeneous Photometry VI: Variable Stars in the Leo I Dwarf Spheroidal Galaxy
• Sizing from the Smallest Scales: The Mass of the Milky Way
• RR Lyrae Variable Stars in the Crater II Dwarf Galaxy
• Proper Motion of the Draco Dwarf Galaxy from Subaru Suprime-Cam Data
• Multi-Periodic Oscillations in Cepheids and RR Lyrae-Type Stars
• The strange evolution of the Large Magellanic Cloud Cepheid OGLE-LMC-CEP1812
• On the Use of Field RR Lyrae as Galactic Probes. VI. Mixed mode RR Lyrae variables in Fornax and in nearby dwarf galaxies
• Plan beta: Core or Cusp?
• A stellar population synthesis approach to the Oosterhoff dichotomy
• XMM-Newton observation of a sample of four close dSph galaxies
• Geometry of the Draco C1 Symbiotic Binary
• Neutron-capture elements in dwarf galaxies III: A homogenized analysis of 13 dwarf spheroidal and ultra-faint galaxies
• The Distance of the First Overtone RR Lyrae Variables in the MACHO LMC Database: A New Method to Correct for the Effects of Crowding
• Dynamics of dwarf galaxies in $f(R)$ gravity
• Gaia Data Release 2: Specific characterisation and validation of all-sky Cepheids and RR Lyrae stars
• Denuded Dwarfs Demystified: Gas Loss from dSph Progenitors and Implications for the Minimum Mass of Galaxies
• Are the double-mode bulge RR Lyrae stars with identical period-ratios the relic of a disrupted stellar system?
• Galactic Orbits of Selected Companions of the Milky Way
• Photometric study of the SMCNOD using variable stars from the OGLE-IV survey
• Luminous Satellites versus Dark Subhaloes: Clustering in the Milky Way
• The VMC Survey -- LIV. Anomalous Cepheids in the Magellanic Clouds Period-Luminosity relations in the near-infrared bands
• Multiwavelength search for counterparts of supersoft X-ray sources in M31
• Photometry of Symbiotic Stars - XIV