The spectroscopic orbits of BV and BW Draconis

Details The spectroscopic orbits of BV and BW Draconis The spectroscopic orbits of BV and BW Draconis

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98...92b&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Jan. 1986, p. 92-98.

Astronomy and Astrophysics

Astronomy

24

Eclipsing Binary Stars, Stellar Orbits, Stellar Spectrophotometry, Circular Orbits, Correlation, Orbital Elements, Radial Velocity, Spectrum Analysis, Stellar Luminosity, Stellar Mass

Scientific paper

Reticon spectra of high dispersion and time resolution have been obtained of BV an BW Draconis, which together form a visual binary and each of which is a W UMa system. The spectra were measured by cross-correlation. The orbital elements of BV Dra have been revised to the values T0 = 2446127.6888, K1 = 93.9 km s-1 and K2 = 233.6 km s-1, while those of BW Dra, determined for the first time, are T0 = 2446135.8067, K1 = 70.5 km s-1 and K2 = 251.5 km s-1. A circular orbit is adopted for each system. Different values of V0 are obtained from each component of each system, but V0 for each pair is close to -60 km s-1. Radial velocities confirm the proper motions in identifying the two systems as a genuine binary (ADS 9537) whose space velocity with respect to the Sun is over 90 km s-1. From spectrophotometry, the components of BV Dra are classified as F9 (more massive star) and F8, with a luminosity ratio (in blue light) of 1.78 (Δm = 0.63), while the components of BW Dra are G3 (more massive star) and G0, with a luminosity ratio (also in blue light) of 1.52 (Δm = 0.45). All four stars are of luminosity class V.

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