| Title | Near-IR observations of NGC 6822: AGB stars, distance, metallicity and structure |
| Authors | Cioni, M. -R. L.; Habing, H. J. |
| Bibcode | 2005A&A...429..837C Search ADS ↗ |
| Abstract | Observations in the IJKs wave bands covering the central 20'× 20' of the Local Group galaxy NGC 6822 have been made with the William Herschel Telescope in La Palma. They have allowed us to characterize, for the first time in the near-infrared across the whole galaxy, its late-type stellar population (i.e. red giant and asymptotic giant branch stars) and to derive from the ratio between carbon-rich and oxygen-rich asymptotic giant branch stars an indication about spatial variations in metallicity. These amount to about 1.56 dex, twice of what has been previously found within each Magellanic Cloud using the same technique. We have calibrated our photometry on the DENIS (I-band) and 2MASS (J and Ks bands) data and obtained a distance modulus of (m-M)0=23.34±0.12 from the position of the tip of the RGB. The large scale distribution of late-type stars suggests that either the galaxy is viewed under a high inclination angle or it has a non-negligible thickness. Tables 1 and 2 are only available in electonic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/429/837 |
| Objects | 1 Objects Search NED ↙ |
