Bibcode
Israelian, G.
Bibliographical reference
Chemical Abundances and Mixing in Stars in the Milky Way and its Satellites, ESO ASTROPHYSICS SYMPOSIA. ISBN 978-3-540-34135-2. Springer-Verlag, 2006, p. 109
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2006
Citations
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Refereed citations
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Description
Abundance analysis of Carbon and Nitrogen has been performed in a sample
of 32 late F and early G type dwarf metal poor stars in the metallicity
range -3.3 < [Fe/H] < 0 using molecular lines of CH and NH in the
near-UV. We find that [C/Fe] decreases slowly with increasing [Fe/H]
while [N/Fe] remains flat. Furthermore we derived uniform and accurate
C/O and N/O ratios using oxygen abundances from near-UV OH lines
employed in our previous studies. We confirm the metallicity dependence
of C/O ratio known from previous studies and caused by the metallicity
dependence of the C yields from massive stars with mass loss. [C/O] does
not remain constant below [O/H]=-0.5 but increases again with a large
scatter. We find that a primary component is required in order explain
the observations of N/O and that the N production history is similar in
our Galaxy and DLAs.