Abstract
HD 163621 is a double-lined spectroscopic binary in a circular orbit whose period is 3.3 days. Spectral classification of the components has proved difficult, but current results of K0 V and late K V are reasonably consistent with our best model of the system, which has spectral types of G8V and K7V. The object shows photometric variability and chromospheric activity and is therefore a member of the BY Draconis class of variables. The minimum masses are quite small, 0.10 and 0.07 M⊙ for the primary and secondary, respectively, suggesting an orbital inclination of about 30°. The system is synchronously rotating. Its distance is estimated to be 31 pc, which makes it an excellent candidate for a trigonometric parallax determination.
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Kitt Peak National Observatory, [U.S.] National Optical Astronomy Observatories, operated by AURA Inc. under contract with the [U.S.] National Science Foundation.
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Griffin, R.F., Fekel, F.C., Morton, M.D. et al. Spectroscopy and orbit determination of the chromospherically active double-lined binary system HD 163621 = V835 Herculis. J Astrophys Astron 15, 309–319 (1994). https://doi.org/10.1007/BF02709307
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DOI: https://doi.org/10.1007/BF02709307