ORBITS FOR NINE BINARIES AND ONE LINEAR SOLUTION

Abstract

ABSTRACT The subject of the present paper is the analysis of the orbital elements for nine binaries: WDS 00463–0634 = HDS 101, WDS 03264+3520 = HDS 430, WDS 03307–1926 = HDS 441, WDS 04025+0638 = HDS 510, WDS 09252+4606 = HDS 1353, WDS 09446+6459 = CHR 176, WDS 10294+1211 = HDS 1507, WDS 10596+1800 = HDS 1568, and WDS 14562+1745 = HDS 2108. The orbital elements are calculated for the first time for all of them. The eight binaries, denoted as HDS, were discovered during the Hipparcos mission. One binary, denoted as CHR, was discovered in the Center for High Angular Resolution Astronomy, CHARA, in 1988. These studied pairs have measured separations of less than 0.41 arcsec. For the eight pairs that have measured separations less than 0.3 arcsec, the resulting orbital periods fall within 16 and 55 years, and for the remaining one pair the orbital period is 94 years. In addition to the orbital elements, we also give (O − C) residuals in θ and ρ, masses, dynamical parallaxes, absolute magnitudes, spectral types, and ephemerides for the next five years. We also present one linear solution for the double star WDS 19218+7708 = HDS 2740 that has also been calculated for the first time. For this system we give (O − C) residuals in θ and ρ as well, along with ephemerides for the next five years.