Other
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9466g&link_type=abstract
HST Proposal ID #9466
Other
Hst Proposal Id #9466
Scientific paper
SBS 1150+599 is a puzzling emission-line object. Optical spectra reveal only strong Balmer, He II and Ne V lines, along with a hot, featureless continuum. We have recently partially resolved the HAlpha emission in a ground-based image, and believe the object to be a new halo planetary nebula, one of only handful known in the Milky Way. If correct, its lack of significant O III and other forbidden emission means that SBS 1150+599 has the lowest metallicity of any known planetary nebula. Our estimate of the oxygen abundance places it 40 times lower than that of K 648 in the globular cluster M15, the previous record holder, and would make it one of the most metal-poor objects in the Galaxy. We propose obtaining ACS images of SBS 1150+599 to confirm that it is a planetary nebula and to determine its morphology. Planetary nebulae in old populations may occur due to binary-star merging, and the morphology may test this hypothesis. We will also study the UV spectrum of SBS 1150+599 using STIS to confirm the O/H value and estimate carbon and nitrogen abundances unobtainable in the optical.
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