Spectroscopy and orbit determination of the chromospherically active double-lined binary system HD 163621 = V835 Herculis

Details Spectroscopy and orbit determination of the chromospherically active double-lined binary system HD 163621 = V835 Herculis Spectroscopy and orbit determination of the chromospherically active double-lined binary system HD 163621 = V835 Herculis

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994japa...15..309g&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 15, no. 3, p. 309-319

Astronomy and Astrophysics

Astrophysics

3

Binary Stars, Line Spectra, Orbit Calculation, Radial Velocity, Stellar Luminosity, Stellar Magnitude, Stellar Orbits, Stellar Spectrophotometry, Visible Spectrum, Chromosphere, Data Correlation, Mass Ratios, Photosphere, Spectrum Analysis, Stellar Activity, Stellar Color, Variability

Scientific paper

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 G8 V and K7 V. The object shows photometric variability and chromospheric activity and is therefore a member of the BY Draconic class of variables. The minimum masses are quite small, 0.10 and 0.07 solar mass for the primary and secondary, respectively, suggesting an orbital inclination of about 30 deg. 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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