The changeover from H to He rich mass loss in PN

Details The changeover from H to He rich mass loss in PN The changeover from H to He rich mass loss in PN

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7837p&link_type=abstract

HST Proposal ID #7837

Physics

Hst Proposal Id #7837 Hot Stars High-Mass Stars

Scientific paper

We image three bright planetary nebulae, which have helium rich stellar atmospheres and helium poor nebulae. However, we think that the inner nebulae must be helium rich on a spatial scale that is very accessible with the NIC1 camera on HST. We would expect the images to show a helium-enriched shell on a scale of app. 1". If observed, this would be the first observation of the changeover from hydrogen rich mass loss to helium rich mass loss in planetary nebulae.

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