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Off the Beaten Path: Gaia Reveals GD-1 Stars outside of the Main Stream

  • Authors: Adrian M. Price-Whelan, and Ana Bonaca

2018 The Astrophysical Journal Letters 863 L20.

  • Provider: AAS Journals

Caption: Figure 1.

On-sky positions of likely GD-1 members in the GD-1 coordinate system. GD-1 is apparent as an overdensity in negative proper motions (top-right panel, orange box), so selecting on proper motion already reveals the stream in positions of individual stars (top-left panel). The stream also stands out in the color–magnitude diagram (bottom-right panel) as older and more metal-poor than the background. Selecting the main sequence of GD-1 (orange, shaded region in the bottom-right panel) along with proper motion cuts unveils the stream in unprecedented detail (bottom-left panel).

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