ASTR 102 Study Guide - Midterm Guide: Accretion Disk, Light Curve, Neutron Star

• School: Queen's University
• Department: Physics, Engineering Physics and Astronomy
• Course: ASTR 102
• Professor: Terry Bridges

Document Summary

Stellar nebula -> average * -> red giant. Stellar nebula -> massive * -> red supergiant -> supernova. Not vacant: filled with gas: 75% h (h2, hi, hii, 25% he, 1% metals and dust, ~micron; absorbs and scatters light: decreases intensity and de-blues . *s from in molecular clouds: density high enough for gravity to overcome gas pressure. Densest regions collapse and form protostars as protostars collapse, gravitations e converted into thermal e as temp and pressure high enough: nuclear fusion = now a star: observe using infrared b/c dust absorbs visible. T tauri stars: young with strong outflow, up to 3m , not on main sequence: ***join main sequence with time mass. 0. 4m : consume core h, in the core: Join when begin h fusion in core: pressure decreases -> core contracts, core increases density and temperature -> nuclear reactions increase, star"s luminosity, size, and surface temperature increase.