Mass loss out of close binaries

Abstract

In a liberal evolutionary scenario, mass can escape from a binary during eras of fast mass transfer. We calculate the mass lost by binaries with a B-type primary at birth where mass transfer starts during hydrogen core burning of the donor. We simulate the distribution of mass-ratios and orbital periods for those interacting binaries. The amount of time the binary shows Algol characteristics within different values of mass-ratio and orbital period has been fixed from conservative and liberal evolutionary calculations. We use these data to simulate the distribution of mass-ratios and orbital periods of Algols with the conservative as well as the liberal model. We compare mass-ratios and orbital periods of Algols obtained by conservative evolution with those obtained by our liberal model. Since binaries with a late B-type primary evolve almost conservatively, the overall distribution of mass-ratios will only yield a few Algols more with high mass-ratios than conservative calculations do. Whereas the simulated distribution of orbital periods of Algols fits the observations well, the simulated distribution of mass-ratios produces always too few systems with large values.

6 pages, 6 figures, accepted for publication in A&A; accepted version

References in corpus (3)

• SB9: The Ninth Catalogue of Spectroscopic Binary Orbits
• A Complete Survey of Case A Binary Evolution with Comparison to Observed Algol-Type Systems
• Spin-up and hot spots can drive mass out of a binary

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• Evolving Low- and Intermediate-Mass Binaries: Departures from Classical Theory