ASTRO 104 Study Guide - Quiz Guide: Solar Luminosity, Stellar Classification, Solar Mass
Document Summary
Destination 8: the pleiades: stellar properties along the main sequence. Blue stars (upper left): most luminous, most massive, youngest, hottest, largest. Red stars (lower right): least luminous, least massive, oldest, coolest, smallest. Hr diagram: plotted with luminosity increasing along the y-axis and. Temperature decreasing along the x-axis: surface flux of thermal source and the relation between luminosity, temperature, and size. Conclusion: luminosity, temperature, and size are monotonically related: main-sequence mass-luminosity relation. L= m^3. 6 is m > 1 solar mass. *luminosity increases rapidly as stellar mass increases: stellar spectra on the main sequence. H lines are the strongest among intermediate temperature stars. H lines are the weakest among hottest (weak) and coolest (very weak) ms stars. All stars with strong h lines have nearly the same colors. All other stars show steady variation in h line strength: basis of spectral classification. Letters refer to relative strength of h lines: temperature.
