Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.1557b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 4, p. 1557-1562.
Astronomy and Astrophysics
Astronomy
6
Cataclysmic Variables, Eclipsing Binary Stars, Ephemeris Time, Stellar Orbits, Mass Transfer, Orbital Elements
Scientific paper
We present 20 new eclipse timings for V4140 Sgr (NSV 12615). The analysis of this data together with 25 timings obtained earlier by Baptista et al. (1989) indicates that the orbital period is not constant. The inclusion of a nonlinear term in the ephemeris to predict the times of minimum is significant at a 3-sigma level, either considering a quadratic or a sinusoidal behavior versus time. If the quadratic fit is the correct one, the system is increasing its orbital period in a timescale of 1.2 x 10 exp 7 years, with a mass transfer rate of about 10 exp -9 solar mass/yr. The corresponding orbital period derivative is very similar to the one earlier determined for Z Cha. If the sinusoidal fit is correct, the system presents a cycle of 5.4 years, which may be explained in terms of a magnetic activity cycle in the secondary star. The observed orbital period variations cannot be explained as a result of either apsidal motion or orbital motion around a third body.
Baptista Raymundo
Jablonski Francisco Jose
Steiner Joao Evangelista
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