M31, NGC 224, Andromeda Galaxy
The Hubble data were taken from the HST proposals 9453 and 10265, PI: T. Brown (STScI); and 11684, PI: R. van der Marel (STScI).
The science team comprises: R. van der Marel, S.T. Sohn, J. Anderson, and T. Brown (STScI), M. Fardal (University of Massachusetts, Amherst), G. Besla (Columbia University), R. Beaton (University of Virginia), P. Guhathakurta (UCO/Lick Observatory/UCSC), and T.J. Cox (Carnegie Observatories).
ACS/WFC: F606W (V) and F814W (I)
WFC3/UVIS: F606W (V)
This image is a composite of separate exposures acquired by the ACS instrument on HST. Several filters were used to sample broad wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are:
Blue: F606W (V)
Red: F814W (I)