Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1976h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 103, no. 6, June 1992, p. 1976-1986. Research supported by Vanderbilt University.
Astronomy and Astrophysics
Astronomy
14
A Stars, Speckle Interferometry, Stellar Orbits, Stellar Spectra, Stellar Systems, Triple Stars, Charge Coupled Devices, Radial Velocity, Stellar Mass, Stellar Parallax
Scientific paper
Eta Virginis is a bright (V = 3.89) triple system of composite spectral type A2 IV that has been observed for over a dozen years with both spectroscopy and speckle interferometry. Analysis of the speckle observations results in a long period of 13.1 yr. This period is also detected in residuals from the spectroscopic observations of the 71.7919 day short-period orbit. Elements of the long-period orbit were determined separately using the observations of both techniques. The more accurate elements from the speckle solution have been assumed in a simultaneous spectroscopic determination of the short- and long-period orbital elements. The magnitude difference of the speckle components suggests that lines of the third star should be visible in the spectrum.
Fekel Francis C.
Hartkopf William I.
McAlister Harold A.
Yang Xinxing
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