Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 421, Issue 4, Pages 2998-3003Publisher
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2012.20525.x
Keywords
stars: variables: Cepheids; galaxies: distances and redshifts; galaxies: individual: NGC 6822; Local Group
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Funding
- National Aeronautics and Space Administration
- National Science Foundation
- National Research Foundation (NRF) of South Africa
- Grants-in-Aid for Scientific Research [23684005] Funding Source: KAKEN
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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 a Large Magellanic Cloud (LMC) distance modulus of 18.50 mag. The standard error of this quantity is similar to 0.05 mag. We show that to derive consistent moduli from Cepheid observations at different wavelengths, it is necessary that the fiducial LMC periodluminosity 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.
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