Characteristics of the Galaxy according to Cepheids

Abstract

Classical and Type II Cepheids are used to reinvestigate specific properties of the Galaxy. A new Type II reddening-free Cepheid distance parameterization is formulated from LMC Cepheids (OGLE), with uncertainties typically no larger than 5-15%. A distance to the Galactic centre of R0=7.8+-0.6 kpc is derived from the median distance to Type II Cepheids in the bulge (OGLE), R0=7.7+-0.7 kpc from a distance to the near side of the bulge combined with an estimated bulge radius of 1.3+-0.3 kpc derived from planetary nebulae. The distance of the Sun from the Galactic plane inferred from classical Cepheid variables is Zsun=26+-3 pc, a result dependent on the sample's distance and direction because of the complicating effects of Gould's Belt and warping in the Galactic disk. Classical Cepheids and young open clusters delineate consistent and obvious spiral features, although their characteristics do not match conventional pictures of the Galaxy's spiral pattern. The Sagittarius-Carina arm is confirmed as a major spiral arm that appears to originate from a different Galactic region than suggested previously. Furthermore, a major feature is observed to emanate from Cygnus-Vulpecula and may continue locally near the Sun. Significant concerns related to the effects of metallicity on the VI-based reddening-free Cepheid distance relations used here are allayed by demonstrating that the computed distances to the Galactic centre, and to several globular clusters (M54, NGC 6441, M15, and M5) and galaxies (NGC 5128 and NGC 3198) which likely host Type II Cepheids: agree with literature results to within the uncertainties.

Accepted for Publication (MNRAS)

References in corpus (40)

• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• New catalogue of optically visible open clusters and candidates
• Northern Sky Variability Survey (NSVS): Public data release
• Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations
• A Geometric Determination of the Distance to the Galactic Center
• A new Cepheid distance to the maser-host galaxy NGC 4258 and its implications for the Hubble Constant
• Old stellar Galactic disc in near-plane regions according to 2MASS: scales, cut-off, flare and warp
• Direct Detection of the Close Companion of Polaris with the Hubble Space Telescope
• A new calibration of Galactic Cepheid Period-Luminosity relations from B to K bands, and a comparison to LMC PL relations
• Cepheid Parallaxes and the Hubble Constant
• The Cepheid Distance to NGC 5236 (M 83) with the VLT
• Using Cepheids to determine the galactic abundance gradient I. The solar neighbourhood
• TASS Mark IV Photometric Survey of the Northern Sky
• Astrometry with Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator RR Lyrae
• MASH-II: More Planetary Nebulae from the AAO/UKST HαSurvey
• The Araucaria Project. Near-Infrared Photometry of Cepheid Variables in the Sculptor Galaxy NGC 300
• The Luminosities and Distance Scales of Type II Cepheid and RR Lyrae variables
• Rate of Period Change as a Diagnostic of Cepheid Properties
• The distance to the Galactic Centre based on Population-II Cepheids and RR Lyrae stars
• Analysing the database for stars in open clusters I. General methods and description of the data
• The Discovery of Cepheids and a Distance to NGC 5128
• New galactic open cluster candidates from DSS and 2MASS imagery
• The Optical Gravitational Lensing Experiment. Is Interstellar Extinction Toward the Galactic Center Anomalous?
• Displacement of the Sun from the Galactic Plane
• NICMOS Observations of Extragalactic Cepheids. I. Photometry Database and a Test of the Standard Extinction Law
• HST Snaphot Study of Variable Stars in Globular Clusters: Inner Region of NGC 6441
• The Araucaria Project. The Distance to the Local Group Galaxy NGC 6822 from Cepheid Variables discovered in a Wide-Field Imaging Survey
• Interstellar extinction towards open clusters and galactic structure
• The Araucaria Project. Near-Infrared Photometry of Cepheid Variables in the Sculptor Galaxy NGC 55
• The Globular Cluster M15. I. Identification, Discovery, and Period Determination of Variable Stars
• Searching for unknown open clusters in the Tycho-2 catalog
• The Araucaria Project. The Distance to the Local Group Galaxy WLM from Cepheid Variables discovered in a Wide-Field Imaging Survey
• The Araucaria Project. The Distance to the Sculptor Group Galaxy NGC 55 from a Newly Discovered Abundant Cepheid Population
• In Search of Possible Associations between Planetary Nebulae and Open Clusters
• Assessing potential cluster Cepheids from a new distance and reddening parameterization and 2MASS photometry
• Deep Photometry of the Globular Cluster M5: Distance Estimates from White Dwarf and Main Sequence Stars
• Discovery of an open cluster with a possible physical association with a planetary nebula
• Warp signatures of the Galactic disk as seen in mid infrared from Midcourse Space Experiment
• Cepheids as Distance Indicators: Some Current Problems
• The effect of metallicity on Cepheid magnitudes and the distance to M33

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