Abstract:In recent years, with massive spectroscopic surveys it is possible
to probe the chemical/star-formation history of the early Galaxy.
In this work, we derive carbon abundances and kinematics for a
subset of 30,000 stars from SDSS-DR7 calibration sample. We confirm
the increase in the CEMP fraction at low metallicities. The
analysis showed that the CEMP fraction of the outer Halo stars is
almost twice the CEMP fraction of the inner Halo stars (Carollo et
al. 2011). Similar enhancement of carbon is also seen among the
stars of ultra faint dwarf satellites (Lai et al. 2011). This
subject recieved an increased attention after the recent discovery
of the C-rich metal poor ([Fe/H] < -3.0) DLA, at a redshift of z=
2.3 (Kobayashi et al 2011), with abundance ratios similar to CEMP
stars. This indicate contributions from Pop-III faint first
supernovae to the early carbon production.
Key words: Metal poor stars: abundances -- carbon, Galaxy: inner/outer Halo