3012A III/12A F5 and Later Stars in SA28, 54, 106, 107 A R Upgren Jr. R T Staron Astrophys. J. Suppl. 19 367 1970 1970ApJS...19..367U Selected areas The catalog is an objective-prism survey of 2181 stars later than spectral class F2; the earlier stars are in catalog ADC# 3011A. The limiting magnitude is about 11.5. Four regions of intermediate galactic latitude are included in this survey. Each region is centered on one of the Selected Areas 28, 54, 106, and 107 and consists of a square 7 degrees on a side or about 50 square degrees in area. The fields, 4 x 4 degrees in size, were each photographed on two IIa-O emulsion plates, one with an exposure time of three minutes on which bright stars could be classified and one with an exposure time of 40 minutes extending to faint stars. The plates were taken with the 24-inch Baker-Schmidt telescope of the Dyer Observatory. The dispersion of the objective prism is about 330 A/mm at H-gamma. The stars were classified according to the criteria established by Nassau and Seyfert (1946) and Nassau and van Albada (1947). Photographic magnitudes were found from direct IIa-O plates taken with the 8-inch Ross camera of the Yale University Observatory. The catalog includes BD numbers, magnitudes, and spectral classes for BD stars. For non BD stars, the BD number listed in bytes 1-3 indicates a nearby BD star from which the star listed is offset by the values in bytes 5-12 and 15-17 given in minutes of arc.

AreaNum Selected Area number --- BD BD number --- PhotoMag Photographic magnitude mag u_PhotoMag Colon for uncertainty in photographic magnitude --- SpTemp Spectral type, temperature class and subclass --- u_SpTemp Colon for uncertainty in temperature class/subclass --- LumCl luminosity class --- u_LumCl Colon for uncertainty in luminosity class --- AreaNum Selected Area number --- BD BD number of nearby star --- RAoffset Right ascension offset from BD star given in bytes 5-12, minutes of arc arcmin DEoffset Declination offset from BD star given in bytes 5-12, minutes of arc arcmin PhotoMag Photographic magnitude mag u_PhotoMag Colon for uncertainty in photographic magnitude --- SpTemp Spectral type, temperature class and subclass --- u_SpTemp Colon for uncertainty in temperature class/subclass --- LumCl luminosity class --- u_LumCl Colon for uncertainty in luminosity class --- C.-H. Joseph Lyu Hughes STX/NASA 1995Jun10 UNKNOWN UNKNOWN This survey is part of a study of stellar densities with a view toward determining the inclination to the galactic plane of surfaces of equal stellar density. Data format modified at the Astronomical Data Center (ADC)/NASA GSFC, 1988 June...WHW III_12A.xml