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An upper main sequence (MS) and main-sequence turn-off (MSTO) feature appearsin the color-magnitude diagram (CMD) of a large area photometric survey of thesouthern half of M31 stretching to M33. Imaging in the Washington M,T_2,DDO51photometric system allows us to remove the background M31/M33 giants from ourCMD and more clearly define the dwarf star feature, which has an MSTO near M ~20.5. The corresponding stellar population shows little density variation overthe 12 X 6 square degree area of the sky sampled and is of very low surfacebrightness, >32 mag/arcsec^2. We show that this feature is not the same as apreviously identified, MS+MSTO in the foreground of the Andromeda Galaxy thathas been associated with the tidal stream ringing the Milky Way disk at lessthan half the distance. Thus, the new stellar system is a separate, moredistant entity, perhaps a segment of tidal debris from a disrupted satellitegalaxy. It is most likely related to the structure with similar distance,location and density uniformity seen as an excess of K and M giants in the TwoMicron All-Sky Survey reported in the companion paper by Rocha-Pinto et al.(2004).Comment: 17 pages, 5 figures, submitted Feb. 9, 2004 to Astrophysical Journal  Letter

Detection of the Main‐Sequence Turnoff of a Newly Discovered Milky Way Halo Structure in the Triangulum‐Andromeda Region