Image Details
Caption: Figure 2.
Top panel: expanded view of the faint-state 1999 Rc-band image of Figure 1, centered here on the LkHα 225 system, with LkHα 225 North and LkHα 225 South both marked. The well-known ridge of nebulosity between them is faint in this stretch, but can be seen extending from North southward to a nebular knot. An even brighter nebular knot along the same line, about 0.8″ northeast (PA = 35.5°) of LkHα 225 South, is marked. The position appears to be coincident with maser spots and 3.1 mm continuum emission; see text. The knot is brighter than LkHα 225 South itself at this particular epoch, and it has some east–west extension. At the western edge of the image, the extended bright nebulosity is associated with V1686 Cyg (LkHα 224) which is just off frame. Bottom panel: bright-state Y-band image taken in 2020 with Keck/NIRSPEC-SCAM; white pixels indicate saturation in the individual 0.655 sec exposures. The frame stack comprises 30 seconds of total integration. Relative to the earlier image above, LkHα 225 South has brightened dramatically compared to LkHα 225 North. A faint instrumental ghost appears to the northeast of LkHα 225 South; this is not the same position as the nebular source marked in the top panel.
© 2022. The Author(s). Published by the American Astronomical Society.