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Area 67 association Lac OB1 astrophotometer beam splitter Bergedorfer catalog Bergedorfer classifications Bergedorfer magnitudes Bergedorfer Spektraldurchmusterung Blaauw COLLIMATING LENS color equivalents comparison concentrated area concentrated region CONDENSER LENS count of stars counts in area Counts per Deg2 Deg2 in Area dispersed area distance modulus distribution early A stars fainter magnitudes foreground stars George Coyne given in Table given spectral class Hardie and Seyfert Harvard College Observatory indicated LACERTA OBI later than F5 listed in column lists the ratio LOWER OBJECTIVE luminosity class magnitudes determined measuring beam monitoring beam Number of Stars objective lens occulting disk overlap region Palomar plate 537 Palomar Sky Survey photographic magnitudes photometric measurements photometric readings photomultiplier proper motions Ratio of Counts raw counts REGION OF LACERTA Selected Area 42 star counts stars earlier stars in area stars later stars measured systematic difference Table 14 Tikhoff images total area type stars viewing screen visual magnitudes zero-age main sequence