منابع مشابه
Extragalactic Stellar Astronomy
Despite their paucity, massive hot stars are real cosmic engines of fundamental importance in shaping our Universe, from its very early stages up to its current appearance. Understanding the physics of massive stars is then a key issue for many relevant astrophysical phenomena. Their spectra provide constraints required for stellar and galactic evolution calculations, such as mass-loss rates, d...
متن کاملStellar Masses
Dependence of other stellar parameters on mass The Russell–Vogt theorem states that, if we know a star’s mass and its CHEMICAL COMPOSITION, we can use the laws of physics to determine all of its other properties: its luminosity, its radius, its temperature and density profiles, and how these properties change with time. (We know that this is a slight simplification; for instance, the amount of ...
متن کاملX-ray Astronomy of Stellar Coronae ⋆
X-ray emission from stars in the cool half of the Hertzsprung-Russell diagram is generally attributed to the presence of a magnetic corona that contains plasma at temperatures exceeding 1 million K. Coronae are ubiquitous among these stars, yet many fundamental mechanisms operating in their magnetic fields still elude an interpretation through a detailed physical description. Stellar X-ray astr...
متن کاملThe Stagnation of Contemporary Stellar Astronomy
The stellar astronomy has always been considered the fundamental source of knowledge about the basic building blocks of the universe — the stars. It has proved correctness of many physical theories — like e.g. the idea of nuclear fusion in stellar cores, the exchange of mass in interacting binaries or models of stellar evolution towards white dwarfs or neutron stars. Despite its well acknowledg...
متن کامل2. Research Programs 2.1 Stellar Astronomy
1. PERSONNEL Staff Members: L. Searle ~Director!, H. Babcock ~Emeritus!, A. Dressler, W. Freedman, J. Kristian, P. McCarthy, E. Persson, G. Preston, A. Sandage, S. Shectman, I. Thompson, R. Weymann Staff Associates: S. Majewski Las Campanas Research Staff: M. Roth ~Director, Las Campanas Observatory!, W. Krzeminski, W. Kunkel Postdoctoral Fellows: J. Dalcanton, A. McWilliam, J. Mulchaey, I. Sma...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1985
ISSN: 0074-1809
DOI: 10.1017/s0074180900078785