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Ch20 Stellar Evo P23
Vocabulary
| Term | Definition |
|---|---|
| Instability Strip | region of the H-R diagram where pulsating post-main-sequence stars are found |
| Planetary Nebula | ejected envelope of a red-giant star with a bare core at the center |
| Black Dwarf | evolutionary endpoint of an isolated, low-mass star after the white-dwarf stage cools |
| Globular Cluster | tightly bound, spherical collection of hundreds of thousands, or millions, of stars |
| Open Cluster | loosely bound collection of tens to hundreds of stars |
| Blue Stragglers | should have already evolved off the main sequence; thought to be the result of star mergers |
| Supernova | explosive death of a more massive star (usually Type II) |
| White Dwarf | small stellar core with a sufficiently high surface temperature that glows white |
| Neutron Star | dense ball of neutrons that remains at the core of a massive star after going supernova |
| Black Hole | region of space where gravity is strong enough to keep light from escaping after a supernova of the most massive stars |
| Cluster Evolution | process by which a group of stars changes over time, which are all the same age but have different masses |
| Main-Sequence Turnoff | where stars are beginning to evolve off the main sequence, indicating a cluster's age |
| Binary System | two stars in orbit around a common center of mass, held together by mutual gravity |
| Roche Lobe | star's zone of gravitational influence, where anything inside is considered a part of the star |
| Lagrangian Point | one of five locations in the plane of two massive bodies orbiting another where a third body of negligible mass can remain in equilibrium |
| Detached Binary | binary system where each star lies entirely within its respective Roche lobe |
| Semi-Detached Binary | binary system where one star fills its Roche lobe, transferring mass to the other star (a.k.a. a mass-transfer binary) |
| Contact Binary | binary star system where both stars fill their Roche lobes and share a common envelope |
| Stellar Nucleosynthesis | production of new atoms by fusion reactions in stars, generating more massive elements not produced by the Big Bang |
Created by:
john_bailey720
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