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Djurašević, G.; Demirçan, Osman; Özdemir, Sacit; Tanriver, Mehmet; Müyesseroğlu, Z.; Ak, H.; Albayrak, B.

doi:10.1023/a:1000699618905

Cited by 1 publication

(1 citation statement)

References 8 publications

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“…Demircan et al (1997) have recently argued that the fainter but hotter and less massive component fills its lobe; q would be smaller than unity and BF Aur would not be inverse Algol. Djurasevic et al (1997) showed that solution with q > 1 is possible, too, and Demircan et al (1997) admitted that it is not possible to resolve between these models Table 2 because they are based on the only one available set of radial velocity curves published by Mammano et al (1974) which does not allow for exact determination of q. The solutions agree that both components are very similar to each other and also the differences in the parameters of both stars given by the respective authors are small.…”

Section: Bf Aurmentioning

confidence: 99%

Variations of the orbital periods in semi-detached binary stars with radiative outer layers

Šimon

1999

Astron. Astrophys. Suppl. Ser.

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Abstract. A detailed analysis of the period changes of sixteen semi-detached binaries which contain only stars with radiative outer layers (ET-systems) has been performed and their respective O-C diagrams are brought and discussed. It was found that the course of the period variations is monotonic and in some systems the period is even constant. This detailed analysis of extensive sets of timings covering several decades brings a strong support to an earlier finding of Hall (1989) and develops it further. We show that all systems with the orbital periods shorter than nine days display constant period or its increase, with the exception of an uncertain case of V 337 Aql. The course of the period variations in TT Aur appears more complex but the cyclic term can be plausibly explained by the third body.A search for general relations between the parameters of the systems and the period changes was undertaken. The mass ratio q appears to play a role in the period variations. Clear changes in systems with orbital periods shorter than 9 days were detected only for q > 0.4 while constant periods are common in systems with q < 0.4 in this period range. The sense of the secular changes in most systems is in accordance with the dominant conservative mass transfer in evolved binary and corresponds to the slow phase. The role of the evolutionary scenarios (case A versus B) and the influence of changes of the rotational angular momenta of the components are discussed.

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Section: Bf Aurmentioning

confidence: 99%

Variations of the orbital periods in semi-detached binary stars with radiative outer layers

Šimon

1999

Astron. Astrophys. Suppl. Ser.

View full text Add to dashboard Cite

show abstract

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Cited by 1 publication

References 8 publications

Variations of the orbital periods in semi-detached binary stars with radiative outer layers

Variations of the orbital periods in semi-detached binary stars with radiative outer layers

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