Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.2051w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 106, no. 5, p. 2051-2057
Astronomy and Astrophysics
Astronomy
6
Eclipsing Binary Stars, Light Curve, Simplex Method, Stellar Luminosity, Triple Stars, Algorithms, Brightness Distribution, F Stars, Radial Velocity, Speckle Interferometry, Spectroscopy
Scientific paper
Recent spectroscopic and speckle-interferometric observations made by separate observers have established the existence of a tertiary component in the V505 Sagittarii system. V505 Sgr has been observed and studied many times since its discovery in 1934, but the light of the third component l3 has never been detected in light curve solutions. In the present study the SIMPLEX algorithm (Kallrath & Linnell, 1987) and the Differential Correction (DC) code (Wilson, 1979) were used to analyze, for the first time, data obtained by Walter (1981). The solutions reveal l3 contributing 7 percent light in the V bandwidth, 5 percent in B, and 4 percent in U. These relative intensities correspond to a star with an F8 V spectrum. Tomkin (1992) obtained F7 V for the third component from his spectroscopic investigation. The photometric mass ratio (q = 0.52) also agrees with Tomkin's study. A comparison between the SIMPLEX and DC solutions is presented.
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