http://www.acs.appstate.edu/dept/physics/spectrum/spectrum.html

SPECTRUM

http://decoy.phast.umass.edu/meyer/ngc2024/node7.html

The Hertzsprung-Russell Diagram

http://donald.phast.umass.edu/theses/allen/age/node1.html

Interpretation and Analysis of H-R Diagrams

http://astro.estec.esa.nl/SA-general/Projects/Hipparcos/hipparcos.html

Hipparcos:Measurement of Positions, Parallaxes and Motions of the Stars

http://sim.jpl.nasa.gov/

Space Interferometry Mission

http://www.ncsa.uiuc.edu/Cyberia/Bima/CBCSpecLines.html

Spectral Lines

http://zebu.uoregon.edu/~imamura/208/jan18/atomic.html

Atomic Physics

http://zebu.uoregon.edu/~imamura/208/jan23/hr.html

The Hertzsprung-Russell Diagram

http://indy4.fdl.cc.mn.us/~isk/stars/1magtab.html

Table of The Brightest Stars

http://astro.estec.esa.nl/Hipparcos/hipparcos.html

Hipparcos

http://www.astro.lsa.umich.edu:80/users/hdproj/

Michigan Spectral Catalogue