Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..631t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 10, 1992, p. 631-638.
Astronomy and Astrophysics
Astrophysics
21
Astronomical Spectroscopy, D Lines, Double Stars, Eclipsing Binary Stars, Stellar Spectra, Triple Stars, Line Spectra, Signal To Noise Ratios, Speckle Interferometry, Spectral Line Width
Scientific paper
Reticon observations of the Na D lines of the secondary V505 Sgr are reported. The semiamplitudes of the primary and secondary are 101.3 +/- 1.8 km/s and 195 +/- 5 km/s, respectively, and yield masses of 2.20 +/- 0.09 and 1.15 +/- 0.05 solar masses, respectively. The Reticon observations also reveal the spectrum of a third component with the sharp-lined spectrum of a late F-type dwarf. Over the 1979-1989 period its radial velocity slowly increased from about -13 to about -8 km/s. The modest slow change of its radial velocity means that it is the same star as the visual companion discovered by speckle interferometry. A spectroscopic measurement of its brightness shows that it contributes 0.08 +/- 0.0 of the total light at 5600 A, which corresponds to Delta-m of 2.7 +/- 0.1 between it and the eclipsing pair.
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