Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...400..649q&link_type=abstract
Astronomy and Astrophysics, v.400, p.649-653 (2003)
Astronomy and Astrophysics
Astrophysics
32
Stars: Binaries: Close, Stars: Binaries: Eclipsing, Stars: Individual: V417 Aql, Stars: Evolution
Scientific paper
A detailed orbital period investigation of the short-period (P=0fd 37) W UMa type star, V417 Aql, is presented based on the analysis of its O-C data. It is shown that the period change of the binary system is continuous. A periodic variation, with a period of 42.4 years and an amplitude of 0fd 0130, is found superimposed on a long-term period decrease (dP/dt=-5.50x10-8 days/year). The period oscillation can be explained either by the light-time effect via the presence of an unseen third body or by magnetic activity cycles of the components. V417 Aql is a W-type overcontact binary system with a low mass ratio of q=0.36. The long-term period variation is in agreement with the conclusion of Qian (\cite{Qian01}b) that a low-mass ratio W-type system usually shows a secular period decrease. This suggests that V417 Aql is on the AML-controlled stage of the evolutionary scheme proposed by Qian (\cite{Qian01}b). Meanwhile, the light-curve paradox encountered by TRO theory is discussed.
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