Evolutionary computations of nonconservative mass transfer in Algols

• Published in: Astronomische Nachrichten 2018-07, Vol.339 (6), p.478-491
• Main Authors: Negu, S. H., Tessema, S. B.
• Format: Article
• Language: English
• Subjects: Angular momentum; binaries: Algols; Critical mass; Evolution; Mass transfer; mass transfer: Method: Numerical; Orbits; Parameters; Statistical analysis
• ISSN: 0004-6337; 1521-3994
• DOI: 10.1002/asna.201813466

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.