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ADDITIONAL RADIAL VELOCITIES OF THE CEPHEID BINARY W SAGITTARII
THEODOR S. JACOBSEN, GEORGE WALLERSTEIN and HELMUT A. ABT
Publications of the Astronomical Society of the Pacific
Vol. 96, No. 582 (August 1984), pp. 630-633
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40678378
Page Count: 4
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Radial-velocities of W Sgr from 28 coudé spectrograms taken during 1980-83 are presented along with velocities of certain standard stars. A mean velocity of -28.0 ± 0.7 km s⁻¹ for a mean epoch of 1981.96 is found. The 1980-83 data indicate that the orbital period is longer than the 80 years previously suggested and that the spectroscopie orbit cannot be obtained at this time. Further observations with high accuracy are required so as to obtain the distance and mass of this speckle and spectroscopie binary.
Publications of the Astronomical Society of the Pacific © 1984 The University of Chicago Press