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The Discovery Of Cepheid Variables And The Period-Luminosity Relation Exercise- Determine The Distance To NGC 7331 DISCOVERY & THE PL LAW DISTANCE TO NGC 7331 ------------------------------------ THE H-R DIAGRAM TYPES OF CEPHEID OUR GALAXY,LMC,SMC DETERMINE THE CEPHEID ------------------------------------ PHYSICS OF CEPHEIDS THE K-MECHANISM RADIUS OF CEPHEIDS RADIUS OF ETA AQUILAE ------------------------------------ CEPHEIDS FOR AMATEURS OBSERVING DELTA CEPHEI OBSERVING ETA AQUILAE   HERE ON THIS PAGE YOU WILL NEED TO INPUT ALL YOUR DATA YOU HAVE COLLECTED SO FAR, WHEN YOU HAVE FINISHED CLICK THE LINK AT THE BOTTOM OF THE SCREEN TO GO ON TO THE FINAL SECTION. ENTER THE 13 VALUES FOR APPARENT MAGNITUDE: THIS IS THE AVERAGE APPARENT MAGNITUDE: ENTER THE 13 VALUES FOR ABSOLUTE MAGNITUDE: THIS IS THE AVERAGE ABSOLUTE MAGNITUDE: ENTER THE VALUE FOR INTERSTELLAR EXTINCTION:   THIS IS THE ABSOLUTE MAGNITUDE CORRECTED FOR INTERSTELLAR EXTINCTION, YOU CAN CHANGE THE VALUE OF EXTINCTION IF YOU WISH. Click Here To Calculate The Distance

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