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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="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Astronomy Reports</journal-id><journal-title-group><journal-title xml:lang="en">Astronomy Reports</journal-title><trans-title-group xml:lang="ru"><trans-title>Астрономический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0004-6299</issn><issn publication-format="electronic">3034-5170</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">355487</article-id><article-id pub-id-type="doi">10.7868/S3034518925110072</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>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">X-RAY BINARIES WITH Be STARS</article-title><trans-title-group xml:lang="ru"><trans-title>РЕНТГЕНОВСКИЕ ДВОЙНЫЕ СИСТЕМЫ С Ве-ЗВЕЗДАМИ</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fedorova</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Федорова</surname><given-names>А. В.</given-names></name></name-alternatives><email>afed@inasan.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tutukov</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Тутуков</surname><given-names>А. В.</given-names></name></name-alternatives><email>atutukov@inasan.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Institute of Astronomy of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Федеральное государственное бюджетное учреждение Российской академии наук Институт астрономии</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-11-15" publication-format="electronic"><day>15</day><month>11</month><year>2025</year></pub-date><volume>102</volume><issue>11</issue><issue-title xml:lang="en">VOL 102, NO11 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 102, №11 (2025)</issue-title><fpage>1036</fpage><lpage>1052</lpage><history><date date-type="received" iso-8601-date="2025-12-02"><day>02</day><month>12</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/" start_date="2026-11-15"/></permissions><self-uri xlink:href="https://journals.rcsi.science/0004-6299/article/view/355487">https://journals.rcsi.science/0004-6299/article/view/355487</self-uri><abstract xml:lang="en"><p>The basic properties of Be stars and X-ray binary systems containing these stars are considered. In the vast majority of these systems the Be stars' companions are neutron stars accreting matter from the decretion disk of a rapidly rotating Be star. The observed properties of such systems are studied within the framework of the hypothesis that the reason for the high rotational velocity of Be stars is the large initial angular momentum of the protostellar cloud, and during the evolution of the star on the main sequence, the angular momentum is transferred from the interior of the star to the surface. The work uses the results of calculations performed earlier by the authors of the evolution of rapidly rotating Be stars, taking into account their stellar wind, which carries away the angular momentum of the outer layers of the star. Based on the rates of rotational mass loss by Be stars through the decretion disk, obtained in these calculations, it is estimated which part of the disk material is captured by the neutron star in observed X-ray binaries with Be stars. For systems with short orbital periods of about 30 days, the maximum value of this part can exceed 0.01. At the same time, for observed systems, this part significantly (sometimes by more than 2 orders of magnitude) exceeds the fraction of the Be star's stellar wind captured by the neutron star.</p></abstract><trans-abstract xml:lang="ru"><p>Рассматриваются основные свойства Ве-звезд и рентгеновских двойных систем, содержащих эти звезды. В подавляющем большинстве этих систем спутниками Ве-звезд являются нейтронные звезды, аккрецирующие вещество декреционного диска быстро вращающейся Ве-звезды. Наблюдаемые свойства таких систем изучаются в рамках гипотезы о том, что причиной высокой скорости вращения Ве-звезд является большой исходный угловой момент протозвездного облака, и в ходе эволюции звезды на главной последовательности происходит перенос углового момента из внутренних областей звезды к поверхности. В работе используются результаты выполненных ранее авторами расчетов эволюции быстро вращающихся Ве-звезд с учетом их звездного ветра, уносящего угловой момент внешних слоев звезды. На основе полученных в этих расчетах темпов ротационной потери массы Ве-звездами через декреционный диск оценивается, какая часть вещества диска захватывается нейтронной звездой в наблюдаемых рентгеновских двойных с Ве-звездами. Для систем с короткими орбитальными периодами около 30<sup>d</sup> максимальное значение этой части может превышать 0.01. При этом для наблюдаемых систем эта часть существенно (иногда более чем на два порядка) превышает долю захватываемого нейтронной звездой звездного ветра Ве-звезды.</p></trans-abstract><kwd-group xml:lang="en"><kwd>X-ray binary systems</kwd><kwd>Be stars</kwd><kwd>decretion disks</kwd><kwd>accretion</kwd><kwd>stellar wind</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>рентгеновские двойные системы</kwd><kwd>Ве-звезды</kwd><kwd>декреционные диски</kwd><kwd>аккреция</kwd><kwd>звездный ветер</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>A. Secchi, Astron. Nachricht. 68, 63 (1867).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>I. Negueruela, I. Steele, and G. Bernaben, Astron. Nachricht. 325, 749 (2004).</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>E. Grundstrom and D. Gies, Astrophys. J. 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