Other
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85.1265m&link_type=abstract
Astronomical Journal, vol. 85, Sept. 1980, p. 1265-1269.
Other
13
Astrometry, Binary Stars, Interferometry, Speckle Patterns, Stellar Spectra, Abundance, Hertzsprung-Russell Diagram, Mass Ratios, Stellar Luminosity, Stellar Mass
Scientific paper
Sixteen speckle interferometric observations of the 281-day spectroscopic and astrometric binary star χ Dra are used to determine the apparent orbit, the masses, and the luminosities of the system. Adoption of the period and eccentricity from the definitive spectroscopic orbit of Vinter-Hansen (1942) leads to the elements α = 0".1240 ± 0".0029 and i = 79°.9 ± 0°.9, which differ considerably from the astrometric elements and confirm the high inclination proposed earlier by other speckle observers. The increased inclination significantly decreases the masses in comparison to the astrometric values, and the system is found to have masses and luminosities of M1 = 0.88Msun ± 0.09Msun, L1 = l.67Lsun ± 0.18Lsun, M2 = O.67Msun ± 0.05Msun, L2 =O.33Lsun ± 0.08Lsun. The excess luminosity of the components with respect to stars of solar composition is consistent with the models given by Perrin et al. (1977), who used the effective temperatures and metal abundance determined by Spite (1967) to derive masses and luminosities in good agreement with the values found here.
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