The Cepheid distance to the Local Group Galaxy NGC 6822

Abstract

Recent estimates of the Cepheid distance modulus of NGC 6822 differ by 0.18 mag. To investigate this we present new multi-epoch JHKs photometry of classical Cepheids in the central region of NGC 6822 and show that there is a zero-point difference from earlier work. These data together with optical and mid-infrared observations from the literature are used to derive estimates of the distance modulus of NGC 6822. A best value of 23.40 mag is adopted, based on an LMC distance modulus of 18.50 mag. The standard error of this quantity is ~0.05 mag. We show that to derive consistent moduli from Cepheid observations at different wavelengths, it is necessary that the fiducial LMC period-luminosity relations at these wavelengths should refer to the same subsample of stars. Such a set is provided. A distance modulus based on RR Lyrae variables agrees with the Cepheid result.

accepted for publication in MNRAS

References in corpus (4)

• Cepheid Parallaxes and the Hubble Constant
• Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes
• Cepheid Period-Luminosity Relations in the Near-Infrared and the Distance to M31 from the Hubble Space Telescope Wide Field Camera 3
• The Large Magellanic Cloud and the Distance Scale

Cited by in corpus (28)

• The Universal Stellar Mass-Stellar Metallicity Relation for Dwarf Galaxies
• Large Magellanic Cloud Near-Infrared Synoptic Survey. II. The Wesenheit relations and their application to the Distance scale
• The Local Group Galaxy NGC 6822 and its Asymptotic Giant Branch Stars
• High-precision distance measurements with classical pulsating stars
• The Local Group Galaxy IC1613 and its Asymptotic Giant Branch Variables
• A New Cepheid Distance Measurement and Method for NGC 6822
• Detailed abundance analysis of globular clusters in the Local Group: NGC 147, NGC 6822, and Messier 33
• Detailed chemical composition of classical Cepheids in the LMC cluster NGC 1866 and in the field of the SMC
• The Sample of Red Supergiants in Twelve Low-Mass Galaxies of the Local Group
• Carbon stars as standard candles: II. The median J magnitude as a distance indicator
• On the central helium-burning variable stars of the LeoI dwarf spheroidal galaxy
• Carbon stars as standard candles -- III. Un-binned maximum likelihood fitting and comparison with TRGB estimations
• Ca II triplet spectroscopy of RGB stars in NGC 6822: kinematics and metallicities
• A state-of-the-art analysis of the dwarf irregular galaxy NGC 6822
• Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822
• Evolved Massive Stars at Low-metallicity IV. Using 1.6 $\mu$m "H-bump" to identify red supergiant stars: a case study of NGC 6822
• HI Kinematics, Mass Distribution, and Star Formation Threshold in NGC 6822, using the SKA pathfinder KAT-7
• The Rotation of the halo of NGC 6822 from the radial velocities of carbon stars
• NGC 6822 as a probe of dwarf galactic evolution
• Variable Stars and Galactic Structure
• Time-Series Surveys and Pulsating Stars: The Near-Infrared Perspective
• The Complex Upper HR Diagram
• Asymptotic Giant Branch Variables as Extragalactic Distance Indicators
• Evidence for Photometric Contamination in Key Observations of Cepheids in the Benchmark Galaxy IC 1613
• The dwarf irregular galaxy NGC 6822. II. Young, intermediate and old stellar populations: comparison between theory and observations
• San Pedro Meeting on Wide Field Variability Surveys: Some Concluding Comments
• On the dwarf irregular galaxy NGC 6822. I. Young, intermediate and old stellar populations
• A sensitive search for water masers associated with star formation regions in the Local Group galaxy NGC 6822