Journal or Publication Title:

Բյուրականի աստղադիտարանի հաղորդումներ: Երևանի աստղադիտարանի բյուլետեն = Сообщения Бюраканской обсерватории. Бюллетень ереванской Астрономической обсерватории = Contributions from the Burakan observatory. Bulletin of the Erevan astronomical observatory

Date of publication:

2025

Volume:

72

Number:

2

ISSN:

2579-2276

Coverage:

386-389

Abstract:

We study the decretion disks formed around Be stars and characterized by the outflow of matter, unlike accretion disks. It is shown that, despite the opposite direction of the mass flow, the evolution of a large-scale magnetic field in such disks can be described within the framework of a large-scale dynamo approach. Field generation is considered a result of the combined action of the alpha effect and differential rotation. Peaceman – Rachford method was used to numerically solve the dynamo equation in a thin disk. Based on the observational data, a module simulating periodic emissions of substance and frozen-in magnetic fields was integrated into the computational code. The simulation is quite similar to that for accretion disks. Its results confirm the possibility of magnetic field generation in decretion disks.

Format:

pdf

Identifier:

oai:arar.sci.am:426397

General note:

Communications of the Byurakan Astrophysical Observatory (ComBAO) is a peer-reviewed scientific journal, which publishes research in observational and theoretical astronomy/astrophysics and presents recent advances in these fields. It is being published by the NAS RA V. Ambartsumian Byurakan Astrophysical Observatory (BAO) in English in electronic form. The journal publishes original papers, review papers, brief reports, book reviews, special communications, observational and theoretical results in various fields of astronomy and related sciences, and some editorial notes, including anniversaries and obituaries. Under the heading “Legacy”, the renewed magazine will republish some old articles of high value in English. The heading “Guest articles” will bring to the attention of readers the articles of researchers who are not employees of BAO. ComBAO was founded in 1946 and regularly published in 1946-1990. However, the publication was interrupted because of the economic situation after the disintegration of the Soviet Union in 1991.

Location of original object:

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