The orbit of the double-line spectroscopic binary system HR 7112 |
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Authors: | P N Appleton J J Eitter C Uecker |
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Institution: | (1) Erwin W. Fick Observatory, Department of Physics and Astronomy, Iowa State University, USA |
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Abstract: | We present velocity observations, obtained with the E. W. Fick Observatory 0.6 m telescope, of the 7th magnitudeK1 star HR 7112. Our observations show that HR 7112 is a double-line spectroscopic binary system composed of almost equal mass
stars with a period of 215.6 days. The orbit has an eccentricitye = 0.142 and the stars orbit each other with a mean semi-major axis distance of approximately 0.4sin(i) AU. The masses of
the stars are consistent with the classification as giant stars. Tidal effects are known to circularise the orbits of giant
stars and this process is apparently underway in this system. |
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Keywords: | Spectroscopic binary stars radial velocity |
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