Distance and reddening of the Local Group dwarf irregular galaxy NGC 6822

Pietrinferni, A.; Monelli, M.; Cassisi, S.; Bono, G.; Buonanno, R.; Fusco, F.
Bibliographical reference

Astronomy and Astrophysics, Volume 548, id.A129, 5 pp.

Advertised on:
12
2012
Number of authors
6
IAC number of authors
1
Citations
13
Refereed citations
11
Description
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. Based on observations collected with the ACS onboard the NASA/ESA HST.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
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Matteo
Monelli