Introduction to nearby young stellar moving groups - 물리천문학부 천문학전공

Colloquium

Astronomy Colloquium (2019 Fall Semester)

* Date: Nov. 14
* Speaker: Dr. Jinhee Lee (Kyung Hee Univ.)
* Title: Introduction to nearby young stellar moving groups
* Abstract

Nearby young moving groups (NYMGs hereafter) are loose stellar associations located within 100 pc of the Sun with ages of 5-100 Myr. NYMGs are unique objects in astronomy because of their proximity and young age. NYMG members are prime targets for exoplanet imaging, useful in calibrating age-dating methods and in studying the evolution of low-mass stars. The importance of NYMGs has motivated the intensive search for their members. The identification of NYMG members requires the kinematics and age information of stars. An NYMG membership probability calculation code based on Bayesian inference (BANYAN) has become a standard in numerical calculations of NYMG membership probability. In this talk, I will introduce NYMGs and an upgraded membership calculation code (BAMG) using improved models of NYMGs and field stars. Utilizing this code, we re-evaluated memberships of previously known NYMG members and identified low-mass candidate members from Gaia DR2. Preliminary follow-up observation results will be presented as well. One of the issues in NYMG studies is the ambiguity of identified NYMGs, which can be solved by utilizing machine learning methods. I will also present a preliminary result of the machine learning analysis of NYMGs.

Date	Speaker	Title	Remarks
Sept 04 (Wednesday)	Dr. Bomee Lee (Caltech)	Probing the nature of dark matter through measurements of galaxy shapes	Wednesday
Sept. 12	No Colloquium	추석연휴
Sept. 19.	권오철 작가님	우주에 대한 호기심이 영화가 되기 까지
Sept. 26	Prof. Jongchul Chae (SNU)	Three-minute Umbral Oscillations in Sunspots [태양흑점의 3분 암부진동]
Oct. 2	Dr. Jeongwoo Lee (New Jersey Institute of Technology/ ISS, Shandong Univ.)	EUV and Microwave Studies of a Circular-Ribbon Solar Flare	Wednesday
Oct. 10	Dr. Michiel van Noort (Max-Planck Institute for solar system research),	Image restoration of solar data using multi frame blind deconvolution
Oct. 17	No Colloquium	Korean Astronomical Society Meeting
Oct. 24	Dr. Jongwan Ko (KASI)	Finding the origin of intracluster light	Talk in Korean
Oct. 31	Dr. Bernd Husemann (MPIA)	Characterizing multi-phase gas outflows and their powering mechanism in nearby AGN
Nov. 7	Prof. Hirofumi NODA (OSAKA Univ.)	Structure and State Transition of Supermassive Black Hole Accretion Flow Studied by Multi-Wavelength Observations
Nov. 14	Dr. Jinhee Lee (Kyung Hee Univ.)	Introduction to nearby young stellar moving groups
Nov. 21	Dr. Nobuyuki Sakai (KASI)	Mapping the Milky Way with Astrometry
Nov. 28	박새별 (KAIST / 안테나뮤직)	예술과 과학의 상호작용- 문화기술(Culture Technology)의 이해와 가능성
Dec. 5	Dr. Do-Young Byun (KASI)	The Extended KVN Project	Talk in Korean
Dec. 27.	Prof. Paul Yun, NASA Solar System Ambassador	NASA Space Economy	11:00 AM

2019 Fall semester detail