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Evolutionary computations of nonconservative mass transfer in Algols
Author(s) -
Negu S. H.,
Tessema S. B.
Publication year - 2018
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.201813466
Subject(s) - subgiant , physics , angular momentum , orbit (dynamics) , radius , computation , classical mechanics , mechanics , astrophysics , stars , mathematics , computer security , globular cluster , algorithm , computer science , engineering , aerospace engineering
We applied the basic dynamical evolution equations of orbit for nonconservative mass transfer to compute the absolute parameters of Algols and incorporate their decreasing orbital periods. The lists contain the parameters of 59 Algols. The accretors of those systems are almost all located in the main sequence region, while their donors are evolved off the main sequence region, and they are located in a giant or subgiant region. We investigated the evolutionary computations of nonconservative mass transfer with the observed parameters of Algols, which has been designed to consistently examine the statistical analysis of both single‐ and double‐lined Algols. Then, we numerically determined the spin and the specific angular momentum of the accretor and the donor and also computed the rate of change of the orbital angular momentum and period of these systems. In addition, we calculated the semimajor axis, the fractional radius of a ring, the actual Roche lobe radius, and the critical mass ratio of the system. We also examined the stability of mass transfer in those systems. Finally, we made a comparison between the theoretical computations for the dynamical evolution equations of orbit and the observed parameters of Algols.