Speaker
Ms
Kaitlin Rasmussen
(University of Notre Dame)
Description
We present an analysis of the elemental abundances for a sample of 34
relatively bright carbon-enhanced metal-poor (CEMP) stars with [Fe/H] <
-2 and [C/Fe] > +0.7, identified from among candidate very metal-poor
stars observed by the RAVE survey. Although RAVE does not obtain carbon
abundance estimates, medium-resolution (R ~ 1,800) spectroscopic
follow-up of some 1700 RAVE stars indicated a total sample of approximately 150 CEMP candidates. Once they were identified as CEMP stars, we used the
South African Large Telescope (SALT) with the High Resolution
Spectrograph (HRS, R ~ 34,000) to obtain high-S/N, high-resolution data
for a sample of well over 100 CEMP stars. The subset of 34 stars we
report on here includes objects with the lowest metallicities and highest
[C/Fe] ratios.
We obtain stellar parameter estimates, as well as [C/Fe], [Sr/Fe],
[Ba/Fe], and [Eu/Fe] ratios, allowing for classification into the four
CEMP sub-classes defined by Beers & Christlieb (2005): CEMP-s, CEMP-r,
CEMP-i (-r/s) and CEMP-no. Once our analysis is completed, the full
sample will be the largest abundance study of CEMP stars available, and
will inform a number of fields, including first-star nucleosynthesis,
the r-, s-, and i-processes in the early Universe, and Galactic
chemodynamical evolution.
Primary author
Ms
Kaitlin Rasmussen
(University of Notre Dame)
Co-authors
Mr
David Kalamarides
(University of Notre Dame)
Dr
Eric Depagne
(South African Astronomical Observatory)
Dr
Jinmi Yoon
(University of Notre Dame)
Prof.
Timothy Beers
(University of Notre Dame)
Dr
Vinicius Placco
(University of Notre Dame)