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Astronomy Colloquium (2015 Fall Semester)

* Date
9. 10.
* Speaker
Prof. Norbert Langer (Univ. Bonn)
* Title
Stars at the Eddington limit
* Abstract
 

 

It is often assumed that when stars reach their Eddington limit, strong outflows are initiated, and that this happens only for extreme stellar masses. I discuss here that not even in models of up to $500mso$, the Eddington limit is reached at the stellar surface. Instead, I will argue that the Eddington limit is reached inside the stellar envelope, in hydrogen-rich stars above $sim 1 … 30mso$ and in Wolf-Rayet stars above $sim 7mso$, with drastic effects for their struture and stability. I will discuss the observable consequences and present observational evidence.
DateSpeakerTitleRemarks
9. 3.Dr. Yun-Kyeong Sheen
(Univ. Concepcion)
Recent galaxy mergers and residual star formation of red sequence galaxies in galaxy clusters 
9. 10.Prof. Norbert Langer (Univ. Bonn)Stars at the Eddington limit 
9. 17.Dr. Youngmin JeangAhn
(University of Arizona)
Orbital distribution of asteroids on the inner solar system and their impact fluxes on the Earth, the Moon and Mars 
9. 24.Dr. Encarni Romero Colmenero /
Dr. Steven Crawford (SALT)
1. The South African Astronomical Observatory
Encarni Romero Colmenero (SAAO/SALT)
2. Transformation of Star-bursting Galaxies in Galaxy Clusters
 
10. 1.Dr. Eunhyeuk Kim
(Korea Aerospace Research Institute)
Introduction to Korean Lunar MissionsSpeech
in Korean
10. 8Prof. Changbom Park (KIAS)고천문학(Historical Astronomy)의 세계와 의의Speech
in Korean
10. 15. 한국천문학회 
10. 22.Dr. Woong-Seob Jeong (KASI)Near-Infrared Imaging Spectroscopic Survey in Space 
10. 29.Dr. Raphael Gobat (KIAS)Galaxy evolution in dense environments at z~2 
11. 5.Dr. Luc Dessart
(Observatoire de la Cote d’Azur)
A massive star life: from main sequence to explosion and supernova 
11. 12.Dr. Edmund Hodges-Kluck
(Univ. Michigan)
Recent Developments in Gaseous Galaxy Halos 
11. 19.Dr. Dae-Won Kim (ASIAA)An Overview of Gaia – Data Intensive Astronomy 
11. 26.Dr. Emanuele Daddi (CEA Saclay)Insights into the crucial phases of cluster formation at high redshifts 
12. 3. No Colloquium 
12. 10.홍승수 명예교수
(서울대학교 물리천문학부)
융합적 사유를 위한 사실에서 진실 찾기Speech
in Korean
12. 22.Dr. Tali Palma (Pontificia Universidad Catolica de Chile)Variable stars in the VVV Survey
Special
Seminar