1- Pulsators in late stages of stellar evolution: their location in the HR diagram - … Astronomers refer to the aging of a star as stellar evolution. The initial phase of stellar evolution is contraction of the protostar from the interstellar gas, which consists of mostly hydrogen, some helium, and traces of heavier elements. Rotating and electrically charged Kerr-Newman black holes 4.5. Stages of Evolution of a Low-Mass star: Main Sequence star Red Giant star Horizontal Branch star Asymptotic Giant Branch star Planetary Nebula phase White Dwarf star Some of the absent disk matter may have gone into making planetesimals, from which planets might eventually form. The final stages of stellar evolution. Gravitational collapse 4.3. Lecture 16: The Evolution of Low-Mass Stars Readings: Ch 21, sections 21-1 & 21-2, and Ch 22, sections 22-1 to 22-4 Key Ideas Low-Mass Star = M < 4 M sun. The stage of stellar evolution may last for between 100,000 and 10 million years depending on the size of the star being formed. Overview. Figure 1. The role of gravity in the formation and evolution of stars 4.2. The "black hole has no hair" theorem 4.6. Schwarzschild static black holes 4.4. Gérard Vauclair Observatoire Midi-Pyrénées, Toulouse. To a biologist, changes that occur in the lifetime of a living organism are referred to as aging. Massive stars transform into supernovae, neutron stars and black holes while average stars like the sun, end life as a white … Originally they were thought to be a region around a star where planets would form. Laws of black hole dynamics 4.7. In due course, when all hydrogen in the core is exhausted, a star must make more dramatic changes in its structure. Stars come in a variety of masses, and the mass determines how radiantly the star will shine and how it dies. Second COROT-BRASIL Workshop, November 5, 2005. Seven Main Stages of a Star. On human timescales, most stars do not appear to change at all, but if we were to look for billions of years, we would see how stars are born, how they age, and finally how they die. Topic 14 – Stellar evolution 14.3 - Understand the effects of the interaction between radiation pressure and gravity in a main sequence star 14.4 - Understand changes to the radiation pressure-gravity balance at different stages in the life cycle of a star with a mass similar to the Sun Many stars are members of binary or multiple systems, and understanding how these systems form and evolve over time is an important part of stellar … ASTEROSEISMOLOGY OF LATE STAGES OF STELLAR EVOLUTION. Planetary Nebula is a misleading name. The weak T Tauri stars are of particular interest since they provide astronomers with a look at early stages of stellar evolution unencumbered by nebulous material. 14.9 - Understand the principal stages and timescales of stellar evolution for stars of similar mass to the Sun, including: c) planetary nebula. If the final result is … Before we discuss the last stage of a star's life, let's take a moment to discuss another class of stars that can span all stages of stellar evolution -- the binary stars. Representative stages in post–Main Sequence evolution. This is … Stellar evolution is a description of the way that stars change with time.