OMEG 2017, International Symposium on Origin of Matter and Evolution of Galaxies, Daejeon, Korea, JUNE 27-30, 2017

Session

Session 1 (Chair: Y. S. Lee)

27 Jun 2017, 09:40

Hotel ICC, Daejeon, Korea

54. Observational constraints on first-star nucleosynthesis

Timothy Beers

27/06/2017, 09:40

Oral Presentation

Over the past 25 years, it has been recognized that the light element carbon plays a crucial role in the early chemical enrichment of the Universe. One fundamental observation is that the frequency of the so-called carbon-enhanced metal-poor (CEMP) stars in the Milky Way increases dramatically with decreasing iron abundance – from 20% of all stars with [Fe/H] < -2.0 to > 80% of stars with...

108. New site for neutron-capture in population III and population II stars

Projjwal Banerjee

27/06/2017, 10:05

Oral Presentation

We propose a new site for neutron-capture process in massive metal-free and metal-poor stars during the late stages of their evolution. We find that a wide range of neutron-capture abundance patterns can be produced which can explain origin of neutron capture elements observed in many metal-poor stars including CEMP-s, CEMP-rs, and CEMP-no stars. This can fundamentally change our...

56. Blocking metal accretion onto population III stars by stellar wind

Shuta Tanaka

27/06/2017, 10:25

Oral Presentation

Low-mass population III (PopIII) stars of $< 0.8 M_{\odot}$ could survive up until the present, if they were formed. Non-detection of low-mass PopIII stars in our Galaxy has already put a stringent constraint on the initial mass function (IMF) of PopIII stars, suggesting that PopIII stars have a top-heavy IMF. On the other hand, some claims that the lack of such stars stems from metal...

109. Lithium-rich very metal-poor stars discovered with LAMOST and Subaru

Wako Aoki

27/06/2017, 10:45

Oral Presentation

Lithium is a unique element that is produced in the Big Bang nucleosynthesis but is destroyed by nuclear reactions inside stars. As a result, almost constant lithium abundance is found in unevolved main-sequence metal-poor stars, although the value is systematically lower than that expected from standard Big Bang nucleosynthesis models, whereas lithium abundances of red giants are more than...