Uv Spectroscopy of Two Very C-Poor Halo Planetary Nebulae CYC3MEDIUM

Details Uv Spectroscopy of Two Very C-Poor Halo Planetary Nebulae CYC3MEDIUM Uv Spectroscopy of Two Very C-Poor Halo Planetary Nebulae CYC3MEDIUM

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4383t&link_type=abstract

HST Proposal ID #4383

Computer Science

Hst Proposal Id #4383

Scientific paper

Spectroscopic observations with HST of the C-poor halo PNe M2-29 and DDDM-1 are proposed to study their UV spectrum and determine accurate chemical abundances. M2-29 and DDDM-1 are the most deficient in Ar and S of their group. Accurate C and N abundances for these objects will permit us to: a) study the chemical evolution of the ISM in the early epochs of the formation of the Galaxy, b) determine the fraction of C in the interstellar medium at present produced by SNe of Types II and Ib and the fraction produced by stars with initial masses < 8 Mo (the progenitors of PNe and SNeIa, c) constrain observationally the nuclear reaction rate C(alpha,gamma)O by comparing the observed C/O ratio in the primitive halo with the C/O ratio predicted from SNe models, and d) study and constrain the stellar evolution models of low mass stars, those with initial masses in the 0.8 - 1 Mo range.

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