Abstract
Observations of the 21-cm line of neutral hydrogen in absorption made with the Very Large Array (VLA) towards the thermal radio source in the planetary nebula NGC6302 show two velocity components at 6 and −40 km s−1 (radial velocity with respect to the local standard of rest). The 6 km s−1 component is probably due to a line-of-sight cloud, while the −40 km s−1 component is most likely associated with NGC6302. We interpret this latter absorption component as coming from the neutral, outer part of an expanding (∼10 km s−1) ring whose inner part is ionized and produces the absorbed thermal continuum radiation. The mass in atomic hydrogen of the outer (neutral) part of the ring is ∼0.06M⊙. NGC6302 is probably in an evolutionary stage intermediate to those of protoplanetary nebulae such as GL2688 and evolved planetary nebula such as NGC7293. This is the first detection of H I associated with a planetary nebula.
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Rodríguez, L., Moran, J. Neutral hydrogen associated with the planetary nebula NGC6302. Nature 299, 323–325 (1982). https://doi.org/10.1038/299323a0
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DOI: https://doi.org/10.1038/299323a0
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