Observational Aspects of Galactic Structure: Lecture Notes Reported by Participants

A/mm absolute magnitude Astronomy bands Blaauw Blanco brightness calibration carbon stars catalogue Cayrel cepheids champ circular velocity classification color d'une density derived determined deux diagram diamètre disk dispersion distance distribution emission equation été étoiles être faint stars fente field Figure focal galactic center galactic plane galactic structure galactique Galaxy globular clusters halo hydrogen interstellar absorption km/sec l'étoile Large Cloud latitudes longitude main sequence mass measured métaux method Milky nebulae number of stars OB stars objects observations Observatory open clusters optical parallaxes parameters peut photoelectric photographic photometry plaque plates polarization population problem proper motions radial velocities radio ratio reddening region rotation curve RR Lyrae variables S-type S-type stars Schmidt solar motion spectral classes spectral type spectrographe spiral arms spiral structure Stars and Stellar Stellar Systems Strömgren surveys telescope tion vitesses radiales wavelength