Abstract
view Abstract Citations (39) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Closest Planetary Nebula, SH 2-216, and Its Interaction with the Interstellar Medium Tweedy, R. W. ; Martos, M. A. ; Noriega-Crespo, A. Abstract We have obtained mosaics of images of the giant planetary nebula, Sh 2-216, in Hα and [N II], covering the entire 1°.6 diameter. These show the interaction with the interstellar medium (ISM) in unprecedented detail. While the restriction of the [O III] zone to the region close to the central star is as expected for the O + + Strömgren sphere in a uniform-density nebula, the lower ionization lines are clearly strongly influenced by the interaction with the ISM. There is much filamentary structure: for example, there are long, thin features in the obvious interaction region to the east (seen in Hα) and much wider structures across the face of the nebula (which are substantially brighter in [N II]). We interpret this as showing that the nebula has a thick outer region which is bright in [N II] and has deep outer corrugations. Over this lies a thin sheet of material that is brighter in Hα and is also the main location of low-ionization emission such as [O I]. Thus, the different characteristics of the filaments are due to projection effects of the same basic structure. Two considerations seem to indicate that the general ISM magnetic field is a significant factor in molding the shape of the nebula: first, the corrugations across the face of the nebula are fairly parallel; second, the planetary nebula ram pressure matches the expected ambient ISM magnetic pressure. We discuss the possibilities for using ancient planetary nebulae as probes of the ISM. Publication: The Astrophysical Journal Pub Date: July 1995 DOI: 10.1086/175871 Bibcode: 1995ApJ...447..257T Keywords: ISM: STRUCTURE; ISM: PLANETARY NEBULAE: INDIVIDUAL ALPHANUMERIC: SH 2-216 full text sources ADS | data products SIMBAD (9)
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