Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...218..152h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 152-160.
Astronomy and Astrophysics
Astrophysics
32
Astronomical Spectroscopy, Binary Stars, Late Stars, Ophiuchi Clouds, Cross Correlation, Line Spectra, Mass Ratios, Orbital Elements, Radial Velocity, Radii
Scientific paper
From a new spectroscopic orbit of the A-type W UMa binary V566 Oph, based on Reticon observations, various parameters are found. The new mass ratio is sufficiently different from other determinations as to invalidate all recent light-curve solutions. The velocity measures themselves are based on fitting theoretical profiles, generated by a physical model of the binary, to the observed cross-correlation function. Such profiles match this function very well, much better in fact than Gaussian profiles which are generally used. The improvement is such that mass ratios based on Gaussian measures should be reexamined and compared with new measures made with synthetic profiles. From an analysis of the mean reddening in the field, a mean spectral type of F2 is found for V566 Oph, corresponding to a mean effective temperature of 6700 K.
Fisher Wesley A.
Hill Gary
Holmgren David
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