Accretion disks in Algols: Progenitors and evolution

Greve, J. P. De

doi:10.1051/0004-6361/201628798

Cited by 10 publications

(8 citation statements)

References 47 publications

(73 reference statements)

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“…In order to avoid the random number f sync , Van Rensbergen & De Greve [14] calculated t sync with a physical model, distinguishing convective from radiative envelopes. Hurley et al [21] use an expression of Hut [22] to calculate t sync for a star with a convective envelope.…”

Section: Tidal Interactionmentioning

confidence: 99%

“…In the papers [12,13], we investigated mass loss from the system (the liberal case) during eras of rapid mass transfer, while using a hot spot mechanism. In [14], we presented models for systems with an accretion disk. Equatorial velocities of gainers were modelled in [15] using magnetic braking to keep the equatorial velocity far below critical during the evolution of the binary.…”

Section: Introductionmentioning

confidence: 99%

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On the Modeling of Algol-Type Binaries

Greve

2021

Galaxies

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In earlier papers, we presented a binary evolutionary code for the purpose of reproducing the orbital parameters, masses, radii, and location in the Hertzsprung Russell diagram (abbreviated as HRD) of well-observed Algol systems. In subsequent versions, the effects of mass and angular momentum losses and tidal coupling were included in order to produce the observed distributions of orbital periods and mass ratios of Algol-type binaries. The mass loss includes stellar wind and possible liberal evolution, when the gainer star is not capable to absorb all of the matter during mass transfer from the donor star. We added magnetic braking to our code to better reproduce the observed equatorial velocities. Large equatorial velocities of mass-gaining stars are now lowered by tidal interaction and magnetic braking. Tides are mainly at work at short orbital periods, leaving magnetic braking alone at work during longer orbital periods. The observed values of the equatorial velocities of mass gainers in Algol-type binaries are mostly well reproduced by our code. According to our models, Algols have short periods with a strong magnetic field.

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Section: Tidal Interactionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

On the Modeling of Algol-Type Binaries

Greve

2021

Galaxies

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“…We demonstrated that a binary with an ongoing mass transfer is a reasonable explanation for both components of the HD 81357 system. A more detailed modelling including an accretion disk, as carried out by Van Rensbergen & De Greve (2016) for other Algols, would be desirable.…”

Section: Stellar Evolution Of Hd 81357 With Mass Exchangementioning

confidence: 99%

Properties and nature of Be stars

Koubský

Harmanec

Brož

et al. 2019

A&A

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Reliable determination of the basic physical properties of hot emission-line binaries with Roche-lobe filling secondaries is important for developing the theory of mass exchange in binaries. It is not easy, however, due to the presence of circumstellar matter. Here, we report the first detailed investigation of a new representative of this class of binaries, HD 81357, based on the analysis of spectra and photometry from several observatories. HD 81357 was found to be a double-lined spectroscopic binary and an ellipsoidal variable seen under an intermediate orbital inclination of ∼(63 ± 5)°, having an orbital period of 33.d77445(41) and a circular orbit. From an automated comparison of the observed and synthetic spectra, we estimate the component’s effective temperatures to be 12930(540) K and 4260(24) K. The combined light-curve and orbital solutions, also constrained by a very accurate Gaia Data Release 2 parallax, give the following values of the basic physical properties: masses 3.36 ± 0.15 and 0.34 ± 0.04M⊙N, radii 3.9 ± 0.2 and 13.97 ± 0.05R⊙N, and a mass ratio 10.0 ± 0.5. Evolutionary modelling of the system including the phase of mass transfer between the components indicated that HD 81357 is a system observed in the final slow phase of the mass exchange after the mass-ratio reversal. Contrary to what has been seen for similar binaries like AU Mon, no cyclic light variations were found on a time scale an order of magnitude longer than the orbital period.

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“…Our previous work (Van Rensbergen & De Greve 2008) used tidal interaction according to Wellstein (2001). In a subsequent paper, Van Rensbergen & De Greve (2016) included a more refined treatment of tidal interactions. Hereinafter, tides for a star with a radiative atmosphere are very different to those of a star in convection (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Magnetic braking at work in binaries

Greve

2020

A&A

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Context. In earlier papers, we aimed to reconstruct the progenitor systems of Algol-type semi-detached binaries. To this end, we developed a binary evolutionary code for the purpose of reproducing the orbital parameters, masses, and location in the HRD of well-observed Algol systems. In this code, the effects of mass and angular momentum losses and tidal coupling were included, but not magnetic braking at that point. In the present paper, we study the effects of magnetic braking on the rotation of the mass gainers in these systems. Aims. Equatorial velocities have been measured for a number of mass-gaining stars in interacting binaries. Tides tend to synchronize the rotation of the gainer, but many observed low equatorial velocities cannot be explained by tidal interactions alone. Methods. We added magnetic braking to our code to better reproduce the observed equatorial velocities. Results. Large equatorial velocities of mass-gaining stars are lowered by tidal interaction and magnetic braking. Tides are mainly at work at short orbital periods, leaving magnetic braking alone at work during longer orbital periods. Conclusions. Slow rotation of mass gainers in Algol-type binaries is mostly well reproduced by our code. However, (not observed) critical rotation of the gainer in some systems cannot be avoided by our calculations.

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Accretion disks in Algols: Progenitors and evolution

Cited by 10 publications

References 47 publications

On the Modeling of Algol-Type Binaries

On the Modeling of Algol-Type Binaries

Properties and nature of Be stars

Magnetic braking at work in binaries

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