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Optically thin circumstellar medium in the beta Lyr A system

Vol. 645
7. Stellar structure and evolution

Optically thin circumstellar medium in the beta Lyr A system

by M. Broz, D. Mourard, J. Budaj, P. Harmanec, H. Schmitt, I. Tallon-Bosc, D. Bonneau, H. Bozic, D. Gies, M. Slechta 2021, A&A, 645, A51

The paper examines beta Lyr A, which is an archetype of a Roche-lobe overflow binary at a rapid mass transfer phase. Such a binary helps us to understand binary evolution. The authors used an extensive observational dataset, including light curves, optical interferometric data, and high-resolution spectroscopy, for example, and they devised a very complicated model with 38 free parameters. The model contains the primary, the Roche-filling secondary, the optically thick disk, its optically thin atmosphere, the jets, and the shell. The authors are able for their preferred model to account for all types of available observational data and present a “fine” structure of the system.