Abstract
6 Dra has long been known to show small variations in radial velocity, and there is photometric and spectroscopic evidence that its spectrum is composite. We show, largely on the basis of a generous number of photoelectric radial velocities mainly obtained at Cambridge and Fick observatories, that the orbit is of mild eccentricity and has a period of 562 days and a semi-amplitude of 7 km s−1.IUE observations show that the spectrum between 1600 and 1800 ∢ is consistent with its arising from a late-A main-sequence companion
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Based in part on observations made with the Cambridge radial-velocity spectrometer, in part on those made with the Erwin W. Fick Observatory spectrometer, and in part on those made by the International Ultraviolet Explorer and collected at the Villafranca Satellite Tracking Station of the European Space Agency.
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Griffin, R.F., Eitter, J.J. & Reimers, D. The spectroscopic orbit of 6 Draconis. J. Astrophys. Astr. 11, 255–263 (1990). https://doi.org/10.1007/BF02715020
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DOI: https://doi.org/10.1007/BF02715020