37 citations · 37 across the 1 of their papers we have counts for
1 paper · 1 filter
Margaret Meixner, Peter McCullough, Joel Hartman +2
We present HST/NICMOS imaging of the H_2 2.12 μm emission in 5 fields in the Helix Nebula ranging in radial distance from 250-450" from the central star. The images reveal arcuate…