Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..304b&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 91, June-July 1979, p. 304-312.
Astronomy and Astrophysics
Astronomy
36
Binary Stars, Orbital Elements, Visual Observation, Astronomical Spectroscopy, Radial Velocity, Stellar Mass, Stellar Spectra
Scientific paper
High-dispersion spectrograms of the triple system HD 165590 are examined which were obtained during the periastron passage of 1978. The orbital elements are determined by combining the spectroscopic observations with visual observations of the long-period pair. The elements determined include a period of 20.25 yr, an orbital inclination of 82.7 deg, an eccentricity of 0.958, a semimajor axis of 151 billion km, and a longitude of the ascending node of 271.9 deg. A total system mass of 2.51 solar masses and a parallax of 0.024 arcsec are deduced. Reticon observations are discussed which indicate that the short-period binary (0.88-day period) is the visual primary. The spectra of the brighter component of the short-period pair and the visual secondary are shown to be visible in the combined light and to be of approximate types G0 and G5, respectively.
Batten Alan H.
Fekel Francis C.
Morbey Christopher L.
Tomkin Jocelyn
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