Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.271..852m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 271, NO. 4/DEC15, P. 852, 1994
Astronomy and Astrophysics
Astronomy
12
Scientific paper
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.
Griffiths W. K.
Morris Pat W.
Penny Alan J.
Reid Iain Neill
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