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Unformatted text preview: Dark nebulae – extinction & reddening of starlight Emission nebulae/HII regions Regions of star formation Protostar Premain sequence star B. Low mass stars <2-5M o Main sequence – energy source and structural change Post main sequence Red giant – energy source, structural change Planetary Nebula White dwarf – election degeneracy, novae C. Massive stars >5-10M o Main sequence – red supergiant Energy sources and nucleosynthesis in core of star Supernova! Enrichment of IS medium SN1987A Crab Nebula Neutron stars and pulsars (neutron degeneracy) Black holes – event horizon=Schwarzchild radius Singularity Observational evidence – X-ray binaries Variable Stars Pulsational Variable Period – Luminosity Relation RR Lyrae Cepheids Observational Tests clusters – open and globular clusters Ages – main sequence turnoff Distances – main sequence fitting...
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- Spring '08
- Astronomy, main sequence, Photosphere Chromosphere Corona, Premain sequence star, main sequence Red