Subaru Seminars



Home

News

This Month

Introduction

Observing

Science

Gallery

Information

Site Map


Subaru Seminars are usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you would like to give a seminar, please contact Subaru seminar organizers (Rusu Cristian Eduard, Tae-Soo Pyo, Nagayoshi Ohashi) by email : sseminar_at_subaru.naoj.org (please change"_at" to @).

February 21, Wednesday, 13:30pm in 104B

" The initial mass function of the first stars infered from elemental abundances in extremely metal-poor stars "

Dr. Miho Ishigaki (IPMU)


The first generation of (Population III or Pop III) stars are responsible for the first metal-enrichment and producing the first ionizing photons in the early universe. Their physical properties, most importantly, masses are therefore critically important in better understanding the early galaxy formation and the cosmic reionization. Extremely metal-poor (EMP) stars in the Milky Way Galaxy are likely second-generation stars formed out of gas primarily enriched by nucleosynthetic products ejected by supernova explosions of the first stars and thus provide us with an opportunity to observationally access the yet-unknown properties the first stars. We calculate supernova yields of the first stars that best reproduce observed elemental abundance patterns of ~ 200 EMP stars to obtain possible insights into the typical masses of the first stars. We find that the abundance patterns of the EMP stars are predominantly reproduced with the supernova/hypernova yields of the first stars with M<40M_sun leaving behind compact remnants (neutron stars or black holes) with masses up to a few tens of M_sun. I'd like to summarize the possible signatures of the first stars on the EMP stars as well as underlying assumptions and future prospects in this field of study.

Seminars are also held at CFHT, and IfA.



Copyright (c) 1999-2000 Subaru Telescope, NAOJ. All rights reserved.