Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97..202f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, Jan. 1989, p. 202-206.
Astronomy and Astrophysics
Astronomy
7
Chromosphere, Eclipsing Binary Stars, K Stars, Stellar Activity, Stellar Spectra, Calcium, H Alpha Line, Orbit Calculation, Orbital Elements, Potassium, Ubv Spectra
Scientific paper
The variable star HD 136901 = UV CrB is a chromospherically active K2 III single-lined spectroscopic binary with an orbital period of 18.665 days. It has modest-strength Ca H and K emission and UV features, while H-alpha is a strong absorption feature containing little or no emission. The inclination of the system is 53 + or - 12 deg. The v sin i of the primary is 42 + or - 2 km/s, resulting in a minimum radius of 15.5 + or - 0.8 solar. When compared with the Roche lobe radius, this results in a mass ratio of 2.90 or larger. Additional constraints indicate that the secondary has a mass between 0.85 and 1.25 solar. Thus, the mass of the primary is at least 2.5 solar and probably is in the range 2.5-4 solar.
Fekel Francis C.
Kirkpatrick Joseph D.
Strassmeier Klaus G.
Yang Xinxing
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