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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="other" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Fluid Dynamics</journal-id><journal-title-group><journal-title xml:lang="en">Fluid Dynamics</journal-title><trans-title-group xml:lang="ru"><trans-title>Известия Российской академии наук. Механика жидкости и газа</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1024-7084</issn><issn publication-format="electronic">3034-5340</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">672510</article-id><article-id pub-id-type="doi">10.31857/S056852812260076X</article-id><article-id pub-id-type="edn">AKEPHJ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Unknown</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Interaction of the supersonic stellar wind with the incoming flow of the interstellar medium: the influence of the azimuthal magnetic field of the star</article-title><trans-title-group xml:lang="ru"><trans-title>ВЗАИМОДЕЙСТВИЕ СВЕРХЗВУКОВОГО ЗВЕЗДНОГО ВЕТРА С НАБЕГАЮЩИМ ПОТОКОМ МЕЖЗВЕЗДНОЙ СРЕДЫ: ВЛИЯНИЕ АЗИМУТАЛЬНОГО МАГНИТНОГО ПОЛЯ ЗВЕЗДЫ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>KOROLKOV</surname><given-names>S. D.</given-names></name><name xml:lang="ru"><surname>Корольков</surname><given-names>С. Д.</given-names></name></name-alternatives><email>korolkov.msu@mail.ru</email><xref ref-type="aff" rid="aff1"/><xref ref-type="aff" rid="aff4"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>IZMODENOV</surname><given-names>V. V.</given-names></name><name xml:lang="ru"><surname>Измоденов</surname><given-names>В. В.</given-names></name></name-alternatives><email>izmod@iki.rssi.ru</email><xref ref-type="aff" rid="aff3"/><xref ref-type="aff" rid="aff4"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Space Research Institute</institution></aff><aff><institution xml:lang="ru">МГУ им. М.В. Ломоносова, Московский центр фундаментальной и прикладной математики</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="ru">Институт космических исследований РАН</institution></aff><aff><institution xml:lang="en">Space Research Institute</institution></aff></aff-alternatives><aff id="aff3"><institution>МГУ им. М.В. Ломоносова, Московский центр фундаментальной и прикладной математики</institution></aff><aff id="aff4"><institution>Институт космических исследований РАН</institution></aff><pub-date date-type="pub" iso-8601-date="2023-01-01" publication-format="electronic"><day>01</day><month>01</month><year>2023</year></pub-date><issue>1</issue><fpage>31</fpage><lpage>40</lpage><history><date date-type="received" iso-8601-date="2025-02-27"><day>27</day><month>02</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, С.Д. Корольков, В.В. Измоденов</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, С.Д. Корольков, В.В. Измоденов</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">С.Д. Корольков, В.В. Измоденов</copyright-holder><copyright-holder xml:lang="ru">С.Д. Корольков, В.В. Измоденов</copyright-holder></permissions><self-uri xlink:href="https://transsyst.ru/1024-7084/article/view/672510">https://transsyst.ru/1024-7084/article/view/672510</self-uri><abstract xml:lang="en"><p>The problem of the interaction of a hypersonic stellar wind with the surrounding interstellar medium is considered. The media are regarded as fully ionized and are accounted for within the framework of ideal magnetohydrodynamics. The scientific novelty consists in taking into account the magnetic field of a star. The magnetic field qualitatively changes the shape of the astropause under certain parameters. Astropause is a tangential gap that separates the stellar wind from the interstellar medium. Instead of the classical paraboloidal shape, astropause acquires a tube (or cylindrical) shape. It was demonstrated that the tube shape takes place for slowly moving stars or, in the star's coordinate system, for incoming streams with the Mach number ($M_\infty$) less than the critical one. When a critical Mach number ($M_\infty^*$) is reached, the flow regime bifurcates, and the astropause shape changes from tube to classical. For stars with a strong magnetic field, bifurcation occurs at higher Mach numbers than for stars with a weak magnetic field. It is also shown that one more qualitative restructuring of the flow occurs at $M_\infty = 1$. In this case, the shape of the astropause does not change, but a bow shock and a Mach disk are formed.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45181324380944">Рассматривается задача о взаимодействии гиперзвукового звездного ветра с окружающей межзвездной средой. Среды считаются полностью ионизованными и описываются в рамках идеальной магнитогидродинамики. Новизна работы заключается в учете магнитного поля звезды. При определенных параметрах течения магнитное поле качественным образом изменяет форму астропаузы – тангенциального разрыва, отделяющего звездный ветер от межзвездной среды. Вместо классической параболоидальной формы астропауза приобретает трубчатую (или цилиндрическую) форму. Показано, что трубчатая форма имеет место для медленно движущихся звезд или, в системе координат звезды, для набегающих потоков с числом Маха (<italic>M</italic><sub>∞</sub>) меньше критического. При достижении критического числа Маха (\(M_{\infty }^{*}\)) потоком происходит бифуркация режима течения и форма астропаузы изменяется с трубчатой на классическую. Для звезд с сильным магнитным полем бифуркация происходит при бóльших числах Маха, чем для звезд со слабым магнитным полем. Также показано, что при <italic>M</italic><sub>∞</sub> = 1 происходит еще одна качественная перестройка течения, при которой форма астропаузы не меняется, но образуются головная ударная волна и диск Маха.</p></trans-abstract><kwd-group xml:lang="en"><kwd>stellar wind</kwd><kwd>interstellar medium</kwd><kwd>astropause</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>звездный ветер</kwd><kwd>межзвездная среда</kwd><kwd>астропауза</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Parker E.N. The Stellar-Wind Regions // Astrophys. 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