Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6031t&link_type=abstract
HST Proposal ID #6031
Computer Science
Hst Proposal Id #6031 Interstellar Medium
Scientific paper
We propose to carry out FOS spectroscopic observations of the C-poor halo PNe M2-29 and DDDM-1 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 Msun (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 Msun range. During HST Cycle 3 we obtained WFC1 direct imagery in HAlpha of these two very small objects. From these we now have information on their morphology and the surface brightness for planning FOS spectroscopy. In addition, we have discovered a "jet" structure in M2-29 which, in itself, merits spectroscopic study possible only with HST FOS.
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