Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...244..310a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 244, no. 2, April 1991, p. 310-318.
Astronomy and Astrophysics
Astrophysics
17
Astronomical Photometry, Double Stars, Orbital Elements, Stellar Orbits, Subdwarf Stars, Binary Stars, K Stars, Radial Velocity, Stellar Evolution, Stellar Spectra, Ubv Spectra
Scientific paper
Previous observations of HD 89 499 are outlined, and results from radial-velocity monitoring as well as photometric observations are considered. The radial velocities are analyzed through a computer model, and the orbital elements of HD 89 499 are presented. The kinematical parameters of HD 89 499 are obtained, and the properties are discussed. It is concluded from integral properties that HD 89 499 seems to be a bright subdwarf star of early K type; the absolute visual magnitude is found to be around M(v) = +7.0, and the effective temperature corresponds to log T(e) = 3.70. All in all, HD 89 499 seems to be an old binary system with the extremely low abundance of heavy elements, moving with a high space velocity.
Ardeberg Arne
Lindgren Harri
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