Spectroscopy and orbit determination of the chromospherically active double-lined binary system HD 163621 = V835 Herculis |
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| Authors: | R F Griffin F C Fekel M D Morton R E Fried |
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| Institution: | (1) The Observatories, Madingley Road, CB3 0H A Cambridge, England;(2) Department of Physics & Astronomy, Vanderbilt University, 37235 Nashville, Tennessee, USA;(3) Braeside Observatory, P.O. Box 906, 86002 Flagstaff, Arizona, USA;(4) Palomar Observatory, USA;(5) Dominion Astrophysical Observatory, Victoria;(6) Coravel, Geneva Observatory, Haute-Provence |
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| 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.
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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| Keywords: | Stars spectra spectroscopic binaries radial velocities orbits stars individual: HD 163621 |
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