Meridional Circulation in Young Massive Stars with Laminar Rotation

Staritsin, E. I.

doi:10.1134/1.2010652

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…Since the state of rotation of a star after the common envelope stage differs from the evolutionarily determined state of rotation of an isolated star, meridional circulation is the main mechanism of angular momentum transport. This conclusion is similar to the conclusion about the role of meridional circulation in zero-age star models with rotation noticeably different from equilibrium rotation (Staritsin 2005). Only in the outer cell of circulation does the turbulent flux of angular momentum exceed the advective one: thus, the total flux is also directed inwards in this layer of the star (Fig.…”

Section: Resultssupporting

confidence: 87%

“…To solve Eq. ( 6), a difference scheme based on the integrointerpolation method (Samarskij & Popov 1992) was elaborated (Staritsin 1999(Staritsin , 2005(Staritsin , 2007. The method implies an integration of Eq.…”

Section: Transport Of Angular Momentummentioning

confidence: 99%

“…The transport of angular momentum in rapidly rotating isolated Be stars was studied through one-dimensional (Meynet & Maeder 2005;Staritsin 2007Staritsin , 2009Ekstrom et al 2008;Granada & Haemmerle 2014) and two-dimensional (Gagnier et al 2019) approximations. The influence of rotation on a star's structure can be taken into account with Clairaut's theory (e.g., Staritsin 1999). Even in the case of a critical rotation of the star's surface, the dense inner layers rotate slowly.…”

Section: Transport Of Angular Momentummentioning

confidence: 99%

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Asymmetric misfit nanotubes: Chemical affinity outwits the entropy at high-temperature solid-state reactions

Sreedhara

Hettler

Kaplan‐Ashiri

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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Asymmetric two-dimensional (2D) structures (often named Janus), like SeMoS and their nanotubes, have tremendous scope in material chemistry, nanophotonics, and nanoelectronics due to a lack of inversion symmetry and time-reversal symmetry. The synthesis of these structures is fundamentally difficult owing to the entropy-driven randomized distribution of chalcogens. Indeed, no Janus nanotubes were experimentally prepared, so far. Serendipitously, a family of asymmetric misfit layer superstructures (tubes and flakes), including LaX-TaX2 (where X = S/Se), were synthesized by high-temperature chemical vapor transport reaction in which the Se binds exclusively to the Ta atoms and La binds to S atoms rather than the anticipated random distribution. With increasing Se concentration, the LaS-TaX2 misfit structure gradually transformed into a new LaS-TaSe2-TaSe2 superstructure. No misfit structures were found for xSe = 1. These counterintuitive results shed light on the chemical selectivity and stability of misfit compounds and 2D alloys, in general. The lack of inversion symmetry in these asymmetric compounds induces very large local electrical dipoles. The loss of inversion and time-reversal symmetries in the chiral nanotubes offers intriguing physical observations and applications.

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Section: Resultssupporting

confidence: 87%

Section: Transport Of Angular Momentummentioning

confidence: 99%

Section: Transport Of Angular Momentummentioning

confidence: 99%

See 1 more Smart Citation

Asymmetric misfit nanotubes: Chemical affinity outwits the entropy at high-temperature solid-state reactions

Sreedhara

Hettler

Kaplan‐Ashiri

et al. 2021

Proc. Natl. Acad. Sci. U.S.A.

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“…The computations were carried out using the code described in [18], with the modifications [19]. The initial stellar chemical composition was specified to be close to the solar composition: (X, Z) = (0.70, 0.02), where X and Z are the mass abundances of hydrogen and heavy elements.…”

Section: Basic Equationsmentioning

confidence: 99%

Turbulent entrainment at the boundaries of the convective cores of main-sequence stars

Staritsin

2013

Astron. Rep.

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Abstract-Extra mixing of matter in stellar interiors at the boundaries of the convective cores of mainsequence stars is considered for the first time using the physical model of turbulent entrainment developed by Arnett and collaborators based on three-dimensional hydrodynamical simulations. The model takes into account the energy that goes into mixing the matter of the convective core and layers stable against convection located above the core. It is shown that the extent of the region of extra mixing expressed in units of the pressure scale height is not constant, and decreases as the star evolves along the main sequence. Adequate allowance for extra mixing at the boundaries of convective cores is necessary to clarify the relative importance of different mixing mechanisms in stellar interiors, as well as to determine stellar parameters using asteroseismlogy.

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“…Turbulent viscosity coefficients have been determined by Talon and Zahn (1997), Maeder (2003), and Mathis et al (2004). Equations ( 3) and ( 4) are solved along with equations of stellar structure and evolution (Staritsin 1999(Staritsin , 2005(Staritsin , 2007(Staritsin , 2014.…”

Section: Angular Momentum Transfer In the Accretormentioning

confidence: 99%

The Spin-up of a Star Gaining Mass in a Close Binary System on the Thermal Time Scale

Staritsin¹

2022

Res. Astron. Astrophys.

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We investigate the exchange of mass in a binary system as a channel through which a Be star can receive a rapid rotation. The mass-transfer phase in a massive close binary system in the Hertzsprung-gap is accompanied by the spinning up of the accreting component. We consider a case when the mass of the accreting component increases by 1.5 times. The component acquires mass and angular momentum while in a state of critical rotation. The angular momentum of the component increases by 50 times. Meridional circulation effectively transports angular momentum inside the component during the mass-transfer phase and during the thermal time scale after the end of the mass-transfer phase. As a result of mass transfer, the component acquires the rotation typical of classical Be stars.

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Meridional Circulation in Young Massive Stars with Laminar Rotation

Cited by 9 publications

References 7 publications

Asymmetric misfit nanotubes: Chemical affinity outwits the entropy at high-temperature solid-state reactions

Asymmetric misfit nanotubes: Chemical affinity outwits the entropy at high-temperature solid-state reactions

Turbulent entrainment at the boundaries of the convective cores of main-sequence stars

The Spin-up of a Star Gaining Mass in a Close Binary System on the Thermal Time Scale

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