Isolating Red Giants in M31's Outer Spheroid: The Metallicity Gradient

Details Isolating Red Giants in M31's Outer Spheroid: The Metallicity Gradient Isolating Red Giants in M31's Outer Spheroid: The Metallicity Gradient

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aspc...92..540r&link_type=abstract

Formation of the Galactic Halo...Inside and Out, ASP Conference Series, Vol. 92, 1996, Heather Morrison and Ata Sarajedini, eds.

Computer Science

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Scientific paper

The aim of our project is to measure the metallicity gradient in the spheroid of the Andromeda galaxy (M31). Deep KPNO 4-m UBRI images of a 15'times15 ' field in the outer spheroid of M31 are being used to isolate a sample of red giant branch (RGB) stars. These stars are distinguished from the more numerous distant field galaxies on the basis of broadband colors and image morphology. This technique yields a sample of candidate RGBs in M31's spheroid, located about 20kpc from its center (in projection). The shape of the M31 RGB is compared to those of Galactic globular clusters spanning a wide range of (known) metallicities.

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