1999ApJS..124..181W

The H I environment of the Crab Nebula is investigated using 2'.75 and 9' resolution data from the Dominion Radio Astrophysical Observatory Synthesis and Effelsberg 100 m Radio Telescopes, respectively. No clear evidence for an interaction between the Crab and the surrounding H I is found; the Crab probably lies within the boundaries of a large-scale, low-density void in the H I distribution. The presence of a wind-blown H I bubble near the Crab is confirmed, and it is suggested that the unidentified star that powers this bubble is responsible for the stellar wind material detected along the line of sight toward the Crab.