Stellar Archaeology as a Time Machine to the First Stars

Session

CEMP Stars: Observation

6 Dec 2018, 14:30

Lecture Hall (Kavli IPMU)

18. CEMP Stars as Probes of First-Star Nucleosynthesis and Galaxy Assembly

Prof. Timothy Beers (University of Notre Dame)

06/12/2018, 14:30

Carbon enhanced metal-poor stars

Over the course of the past few decades, it has become clear that the class of metal-poor stars known as carbon-enhanced metal-poor (CEMP) stars are powerful probes of a number of areas of interest to contemporary astrophysics. In this contribution, I review the multiple lines of evidence that demonstrate the association of CEMP-no stars (which do not exhibit neutron-capture element...

31. The Mass Distribution of the First Stars revealed by Abundance Pattern Matching of Ultra Metal-Poor Stars

Dr Vinicius Placco (University of Notre Dame)

06/12/2018, 15:15

Carbon enhanced metal-poor stars

In this talk, I will present a Monte Carlo approach to finding suitable stellar progenitors for Ultra Metal-Poor (UMP) stars, based on the discovery of new UMP stars in the Galactic Halo. UMP stars are thought to be formed from gas clouds polluted by the very first (Population III) stars to be born after the Big-Bang. These Pop. III stars are thought to be massive and short-lived, ending their...

65. An abundance of very metal-poor stars in the Solar Neighborhood

Jay Farihi (University College London)

06/12/2018, 15:45

Carbon enhanced metal-poor stars

The number of well-studied very and extremely metal-poor stars is gradually increasing, but still remains limited by the large search volumes necessary to identify them. Here, I will present evidence for a cornucopia of metal-poor dwarf stars (well) within 1 kpc, the so-called dwarf carbon (dC) stars, with order of 1000 already known from the Sloan Digital Sky Survey. The prototype and only...

28. The Origin of CEMP-no Groups in the Milky Way: Connection to the Satellite Dwarf Galaxies

Jinmi Yoon (University of Notre Dame)

06/12/2018, 16:30

Carbon enhanced metal-poor stars

One of the primary goals of Galactic Archaeology is to understand the nature of the first generations of stars, their chemical enrichment, and their contribution to Galactic halo formation. However, only their direct descendants, the CEMP-no stars, are available for indirect studies of their properties. Yoon et al. (2016) claimed that there could be multiple pathways to form the halo CEMP-no...

56. The binarity of dwarf carbon stars and their possible role as main sequence counterparts to CEMP stars

Mr Lewis Whitehouse (University College London)

06/12/2018, 16:50

Carbon enhanced metal-poor stars

Contrary to expectations, the most abundant carbon stars in the Galaxy are long-lived,
main-sequence stars. The origin of these dwarf carbon (dC) stars is an astrophysical
curiosity that is 40 years(!) old, and the mechanisms for enhancing their observed C/O
above unity are poorly constrained. Intriguingly, a significant fraction of the dC stars
have clear halo kinematics, and are thus almost...

24. Structural Patterns of CEMP Stars in the Thick Disk of the Galaxy

Sarah Dietz (University of Notre Dame)

06/12/2018, 17:00

Carbon enhanced metal-poor stars

We present results on the analysis of kinematic and chemical-abundance patterns of stars included in the AAOmega Evolution of Galactic Structure program (AEGIS) and LAMOST DR3. We examine this combined dataset for evidence of carbon-enhanced metal-poor (CEMP) stars associated with the inner halo, thick disk, and metal-weak thick disk (MWTD) of the Galaxy. Of special interest are the CEMP-s...