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Discovery of an Outbursting 12.8 Minute Ultracompact X-Ray Binary

  • Authors: Pawel Pietrukowicz, Przemek Mróz, Andrzej Udalski, Igor Soszyński, and Jan Skowron

2019 The Astrophysical Journal Letters 881 L41.

  • Provider: AAS Journals

Caption: Figure 2.

Location of the variable object in the field of bulge globular cluster Djorg 2. Upper panel: 3′ × 3′ OGLE I-band chart centered on the variable with marked core and half-light circle of the cluster. North is up and east to the left. Middle panel: 9″ × 9″ zoom on the variable that could not be resolved in the ground-based image. Lower panel: cropped HST ACS/WFC image taken in the F606W filter (broad V band) and covering the same small area. The variable star is indicated with the arrow. The closest neighbor, located 0.″3 northeast of the variable, served as a comparison star.

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