HD 103418

내용

Observations of Minor Planets in 1991-1994 at the Bucharest Astronomical Observatory Not Available
Spectroscopic binaries near the North Galactic Pole. XXI - Eight short-period binaries Orbits based principally on radial-velocity measurements made with theHaute-Provence Coravel spectrometer are presented for eight binarysystems which include some of the faintest HD stars in the Galactic-Polefield. They are HD 103418 (which is double-lined), 105021, 108151,113169, 113323, 113650, 113714, and 116514. Their periods range from 3.7to 15.1 days. Very little else is known about any of them.
Narrow-band photometry of G and K stars near the North Galactic Pole Photoelectric narrow-band photometry obtained for 292 late-type starsbrighter than 10 m in the North Galactic Pole area is discussed. The g,n, k, m, f-system of Dickow et al. (1970) is used. The stars were chosenfrom two lists: (1) all stars of spectral type G5 or later in the HenryDraper Catalog (Cannon and Pickering, 1918-1924) within 15 deg of theNorth Galactic Pole, together with a few BD stars; and (2) all starsclassified as K or M giants and in Upgren's 25-31 deg zones (Upgren,1962). For most of the stars, estimates of the following quantities arederived: V-magnitude, R-I color, metal abundance, MV, and theduplicity parameter res(k).

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