Color-Magnitude Arrays for Two Associations in the Large Magellanic Cloud.

Abstract

view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Color-Magnitude Arrays for Two Associations in the Large Magellanic Cloud. Bok, Bart J. ; Bok, Priscilla F. ; Basinski, Jane M. Abstract The paper is concerned with color-magnitude arrays of stars between m =11 and 15 (Mv=~7.5 to -3.5) in two star concentrations in constellation III of the Large Magellanic Cloud, NGC 1955 and 1968-1974, and their im- mediate surroundings. UB V colors of selected OB stars (Mv near -6.0) show that: (1) interstellar reddening is very small or absent; (2) the (B - V)0 colors predicted from the observed values of (B - V) and (U-B) are in excellent agreement with those predicted from the spectral data; (3) in color the OB supergiants of luminosity class Ia in the Large Cloud behave exactly li~e the class Ia supergiants in our galaxy. The two color-magnitude arrays are affected only very slightly by foreground stars. They show that most of the stars in these two groupings fall either in the color-interval B - V= -0.4 to -0.1 or in the interval B- V Q0.4 tc QO.8, with the very blue stars outnumbering those with positive color indices by a factor of 3 or 4 to 1 The membership in the cloud of the very few stars outside these ranges requires checking. Publication: The Astronomical Journal Pub Date: March 1961 DOI: 10.1086/108572 Bibcode: 1961AJ.....66S.279B full text sources ADS |