AS102 Study Guide - Final Guide: Logarithmic Scale, Solar Radius, Main Sequence
Document Summary
A few important features of the h-r diagram: The horizontal axis is plotted in the spectral sequence obafgkm (see the top bar on the main. H-r diagram above), which means the temperature increases as we move from right to left (backwards if you like). I"m sorry if this is a repeat of what i mentioned above. I"m sure you totally understand what this diagram is all about. 2. stars along the top of the h-r are called supergiants because they are large and bright. 3. below these are the giants, not quite as big and luminous as the supergiants. 4. white dwarfs appear near the bottom left and are small and hot. 5. notice the faint, diagonal lines going from lower right to upper left marked as so many solar radii. The h-r diagram gives us the size of stars because if we know its luminosity and temperature we can determine its radius.
