Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225..425k&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 15, 1987, p. 425-436.
Astronomy and Astrophysics
Astronomy
10
Apsides, Eclipsing Binary Stars, Main Sequence Stars, Eccentricity, Stellar Motions, Stellar Orbits
Scientific paper
The superposition of two long-period motions is discovered in the eclipsing binary system DR Vul from period variations over 50 years. Parameters of the long-period orbits have been determined: P3 = 18 yr, α3sin i3 = 3.7×108km, e3 = 0.80, ω3 = 51°; P4 = 47 yr, α4sin i4 = 1.0×109km, e4 = 0.79, ω4 = 118°. The lower limits for masses of the third and the fourth bodies are 3.4 M_sun; and 5.4 M_sun;, respectively. The observed value of the third light is sufficient for a main-sequence star of 8 M_sun;. The value of the apsidal period obtained, U = 36.0 yr, does not differ considerably from previous estimates by Semeniuk and O'Connell.
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