| Issue |
A&A
Volume 548, December 2012
|
|
|---|---|---|
| Article Number | A129 | |
| Number of page(s) | 5 | |
| Section | Galactic structure, stellar clusters and populations | |
| DOI | https://doi.org/10.1051/0004-6361/201220554 | |
| Published online | 05 December 2012 | |
Research Note
Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822⋆,⋆⋆
1 Università di Roma Tor Vergata, via della Ricerca Scientifica 1, 00133 Roma, Italy
e-mail: federica.fusco@roma2.infn.it
2 INAF – Osservatorio Astronomico di Teramo, via Mentore Maggini, 64100 Teramo, Italy
3 Instituto Astrofisico de Canarias, Calle Via Lactea, 38200 La Laguna, Tenerife, Spain
4 Departamento de Astrofísica, Universidad de La Laguna, 38200 La Laguna, Tenerife, Spain
Received: 13 October 2012
Accepted: 23 October 2012
On the basis of a new photometric analysis of the Local Group dwarf irregular galaxy NCG 6822 based on observations obtained with the Advanced Camera for Surveys onboard the Hubble Space Telescope, we have obtained a new estimate of the extinction of two fields located in the southeast region of the galaxy. Because of significant differences in the distance estimates to NGC 6822 available in literature, we decided to provide an independent determination of the distance to this galaxy based on an updated and self-consistent theoretical calibration of the tip of the red giant branch brightness. As a result we newly determined the distance to NGC 6822 to be equal to (m − M)0 = 23.54 ± 0.05, and compared our measurement with the most recent determinations of this distance.
Key words: galaxies: dwarf / Local Group / galaxies: individual: NGC 6822
Photometric data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/548/A129
© ESO, 2012
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