The interaction of the halo around the butterfly planetary nebula NGC650-1 with the interstellar medium

G. Ramos-Larios, M. A. Guerrero, A. Nigoche-Netro +7

With its bright and wide equatorial waist seen almost edge-on (the butterfly body) and the faint and broad bipolar extensions (the butterfly wings), NGC650-1 is the archetypical ex…