The orbit of the speckle and double-lined spectroscopic binary CHI Draconis

Details The orbit of the speckle and double-lined spectroscopic binary CHI Draconis The orbit of the speckle and double-lined spectroscopic binary CHI Draconis

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1236t&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, May 1987, p. 1236-1244. Research supported by Vanderbilt University.

Astronomy and Astrophysics

Astronomy

17

Binary Stars, Speckle Interferometry, Stellar Orbits, Stellar Spectrophotometry, Metallicity, Stellar Luminosity, Stellar Mass

Scientific paper

The authors have used high-resolution, high-signal-to-noise-ratio Reticon and CCD observations of the red and near-infrared spectrum of this double-line spectroscopic binary to measure the first extensive set of secondary velocities and thereby determine a revised spectroscopic mass ratio M1/M2 = 1.38. Analysis of new, and previously published, speckle observations provides the apparent orbit, which, for the first time, can be determined independently of the spectroscopic orbit of the primary. The authors do adopt for the final visual orbit the spectroscopic period, eccentricity, and epoch of periastron passage, which benefit from the much longer time base of the spectroscopic observations. The analysis of the speckle observations leads to the elements a = 0arcsec.122 and i = 74°.9. These results provide new masses and luminosities for the components: M1 = 1.03 M_sun;, L1 = 1.86 L_sun;, M2 = 0.75 M_sun;, and L2 = 0.29 L_sun;. The derived parameters of the components are compared with theoretical isochrones of a slightly metal-poor star. Best agreement is found for an age of 8 billion years. Thus, χ Dra is one of the few systems older than the Sun whose fundamental parameters have been accurately determined, providing a benchmark for evolutionary theory.

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