| Title | A study of the variation in the stellar population in the disc of M31. |
| Authors | Morris, P. W.; Reid, I. N.; Griffiths, W. K.; Penny, A. J. |
| Bibcode | 1994MNRAS.271..852M Search ADS ↗ |
| Abstract | CCD photometry has been performed on four fields in the outer disc on the north-eastern major axis and one in the halo of the Andromeda galaxy (M 31). Colour-magnitude diagrams for each field are presented, which show the brightest 3 mag of the red giant branch. In all cases the giant branch is broad, suggesting a large metallicity dispersion or that mass funnelling is taking place. We use asymptotic giant branch (AGB) stars to investigate population differences between the fields, and find that all possess a strong intermediate-age component. No large differences are found between four fields in the outer disc and the field situated in the halo, which suggests that all fields have a similar star formation history. We have also resolved the low-surface-brightness spur in the north-eastern section of the disc, obtaining the first direct evidence that the stellar populations follow the warp in the gaseous (HI) disc. We derive a distance modulus of 24.3 +/- 0.2. |
| Objects | 1 Objects Search NED ↙ |
