AST-1002 Lecture Notes - Lecture 11: Hypernova, Crab Nebula, Roche Lobe

• School: App State
• Department: Astronomy
• Course: AST-1002
• Professor: Johnny Hollandsworth

Document Summary

Each star controls a finite region of space bound by roche lobe (gravity connecting to the star) Everything with the star is connected to the roche lobe. Bigger star will expand and fill the roche lobe. The little star will take some of the mass from the bigger star. The bigger will lose mass while the smaller gains mass. The smaller can then become a giant and the former bigger will take mass from the former smaller star. White dwarf star- degenerate matter, becomes smaller because more mass pulls more gravity into its center. Semi-detached binary--> one is outside of the roche. Contact binary--> both giants at the same time. Center star is fine, accretion (?) disk is burned away. Can happen over and over again when material is built up again. Recurrent novae- in many cases, the mass transfer cycle resumes after a nova explosion. As the temperature rises, the elements change.