Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2012-01-10
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
accepted for publication in MNRAS
Scientific paper
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.
Feast Michael W.
Matsunaga Norihito
Menzies John W.
Whitelock Patricia A.
No associations
LandOfFree
The Cepheid distance to the Local Group Galaxy NGC 6822 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The Cepheid distance to the Local Group Galaxy NGC 6822, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The Cepheid distance to the Local Group Galaxy NGC 6822 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-462334