Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.8104t&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #81.04; Bulletin of the American Astronomical Society, Vol. 27, p.1402
Astronomy and Astrophysics
Astronomy
Scientific paper
We have carried 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 Type II and the fraction produced by stars with initial masses < 8 M_sun (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 M_sun range. During HST Cycle 3 we obtained WFC1 direct imagery in Hα of these two very small objects.
Dufour Reginald James
Peimbert Manuel
Peña Manuel
Torres-Peimbert Silvia
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