A revised spectroscopic orbit for 93 Leonis (HD 102509)

Details A revised spectroscopic orbit for 93 Leonis (HD 102509) A revised spectroscopic orbit for 93 Leonis (HD 102509)

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..768b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, Oct. 1983, p. 768-774.

Astronomy and Astrophysics

Astronomy

25

Binary Stars, Circular Orbits, Orbital Elements, Stellar Spectrophotometry, A Stars, G Stars, Spectrum Analysis, Stellar Evolution, Stellar Mass

Scientific paper

New high-dispersion spectrograms of 93 Leo provide the data for a revision of the orbital elements of this system which exhibits a composite spectrum (A7 + G5). The orbit is found to be circular and the new elements are: P = 71.6900 days, T(0) = JD2443126.2, V(0) = + 0.4 km/s, K(G) = 29.7 km/s, K(A) = 33.8 km/s. The mass-ratio has been determined for the first time by a spectrophotometric separation of the two spectra. The A-type component of the spectrum arises from the less-massive star, but it is nevertheless the stronger component of the composite spectrum in the normal photographic region - although, until now, no radial velocities have been derived from it. The minimum mass of the G-type star is 1.02 solar mass and of the A-type star 0.89 solar mass. The evolutionary status of the system is briefly discussed.

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