• J. J. Eitter

      Articles written in Journal of Astrophysics and Astronomy

    • The spectroscopic orbit of 6 Draconis

      R. F. Griffin J. J. Eitter D. Reimers

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      6 Dra has long been known to show small variations in radial velocity, and there is photometric and spectroscopic evidence that its spectrum is composite. We show, largely on the basis of a generous number of photoelectric radial velocities mainly obtained at Cambridge and Fick observatories, that the orbit is of mild eccentricity and has a period of 562 days and a semi-amplitude of 7 km s−1.IUE observations show that the spectrum between 1600 and 1800 ∢ is consistent with its arising from a late-A main-sequence companion

    • Spectroscopic binaries near the North Galactic Pole - Paper 22: HR 4793

      R. F. Griffin J. J. Eitter

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      Photoelectric radial-velocity observations, begun independently at Cambridge and at Ames by the respective authors and now including results from no fewer than six radial-velocity spectrometers, show that the K1 III star HR 4793 is a spectroscopic binary; it has a circular orbit with a period of 111 days and the quite modest amplitude of 7kms-1

    • The orbit of the double-line spectroscopic binary system HR 7112

      P. N. Appleton J. J. Eitter C. Uecker

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      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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      Posted on January 27, 2016

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