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| Paper: |
Contribution of HdC Stars to the Galactic Enrichment: The Sr-rich HdC
Star HE 1015-2050 |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
127 |
| Authors: |
Goswami, A.; Aoki, W. |
| Abstract: |
A fraction of the rare class of Hydrogen-deficient carbon (HdC) stars in
our Galaxy are known to exhibit strong features of light neutron-capture
elements such as Sr, Y and Zr usually attributed to the weak component of
the s-process. Believed to be in a very short-lived evolutionary phase,
their ejecta could have significantly contributed to chemical enrichment
in the Galaxy. The origin of these stars have long been disputed and poorly
understood due to a lack of statistically significant sample. From
medium-resolution spectral analyses of a sample of 250 faint high latitude
carbon (FHLC) stars, Goswami et al. (2010) have added a new member
HE 1015-2050 to this rare class that is found to exhibit anomalously
strong features of Sr in its spectrum. Possible scenarios that might have
led to the formation of this object are discussed in the light of existing
scenarios of HdC star formation. |
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