Four-colour and H-beta photometry of B stars in Fehrenbach and Burnage radial velocity fields at B about -30 deg

Astronomy and Astrophysics – Astrophysics

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B Stars, H Beta Line, Interstellar Extinction, Radial Velocity, Stellar Color, Stellar Spectrophotometry, A Stars, Astrometry, Galactic Structure, Late Stars, Stellar Magnitude

Scientific paper

Observations in uvby and H-beta are presented for 39 stars classified as B-type in seven 4 x 4-deg fields studied by Fehrenbach and Burnage (1981, 1982) at b about -30 deg. About half the stars are photometrically little-evolved B stars; most of the rest are intermediate A stars. Intrinsic color and absolute-magnitude calibrations are applied: that of Hilditch et al. (1983) for intermediate A stars is estimated to be much less certain than those for other types. Maps of reddening along lines of sight indicate that little reddening occurs within 100 pc of the sun, that essentially all reddening has occurred within z = + or - 150-200 pc, and that the total reddening is essentially consistent with values given by the Burstein and Heiles (1982) HI/GC method. The luminosities of some faint early B stars cannot be usefully constrained by placing them within the reddening structure. One of the two program stars with very large radial velocities is a horizontal branch object; the other has peculiar colors.

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