The orbit of the classical Cepheid U Aquilae

Details The orbit of the classical Cepheid U Aquilae The orbit of the classical Cepheid U Aquilae

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99..610w&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, July 1987, p. 610-616.

Astronomy and Astrophysics

Astronomy

17

Binary Stars, Cepheid Variables, Radial Velocity, Stellar Orbits, Stellar Oscillations, Stellar Spectrophotometry, Data Reduction, Iue, Spatial Resolution, Spectrum Analysis, Stellar Mass, Ultraviolet Spectra

Scientific paper

A total of 62 new radial-velocity observations of the classical Cepheid U Aql have been obtained during the interval 1969 - 86. The authors present the first determination of a spectroscopic binary orbit for this star. The orbital elements derived from both new and published velocities are given. IUE observations reported by Böhm-Vitense and Proffitt (1985) indicate the presence of an early-type main-sequence companion. The orbital elements combined with estimates of the companion mass result in upper limits for the mass of the Cepheid in the range 6.4 - 8.8 M_sun;. The possibility of spatially resolving the system using interferometric techniques is discussed.

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