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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">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">647573</article-id><article-id pub-id-type="doi">10.31857/S0004629923090049</article-id><article-id pub-id-type="edn">ZKIFBI</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></subject></subj-group></article-categories><title-group><article-title xml:lang="en">MASS RATIO AND ECCENTRICITY DISTRIBUTIONS OF YOUNG SPECTROSCOPIC BINARY STARS</article-title><trans-title-group xml:lang="ru"><trans-title>Распределение молодых спектрально-двойных звезд по отношению масс компонентов и эксцентриситетам</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Eretnova</surname><given-names>O. V.</given-names></name><name xml:lang="ru"><surname>Еретнова</surname><given-names>О. В.</given-names></name></name-alternatives><email>eretnova@csu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Chelyabinsk State University</institution></aff><aff><institution xml:lang="ru">Челябинский государственный университет</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2023-09-01" publication-format="electronic"><day>01</day><month>09</month><year>2023</year></pub-date><volume>100</volume><issue>9</issue><fpage>800</fpage><lpage>810</lpage><history><date date-type="received" iso-8601-date="2025-01-28"><day>28</day><month>01</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, О.В. Еретнова</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, О.В. Еретнова</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">О.В. Еретнова</copyright-holder><copyright-holder xml:lang="ru">О.В. Еретнова</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0004-6299/article/view/647573">https://journals.eco-vector.com/0004-6299/article/view/647573</self-uri><abstract xml:lang="en"><p id="idm45257550535152">We collected the information about 83 pre-main sequence double-lined spectroscopic binaries. Among them there are Ae/Be Herbig stars, T Tauri stars and red dwarfs. The eccentricity – period relation, the mass ratio and eccentricity distributions of young spectroscopic binaries are constructed and analyzed. The overwhelming majority of close binaries with \(P &lt; {{10}^{d}}\) have eccentricity near to zero, the stars less than 1 million years old are rare among them. The mass ratio distribution of systems with \(P &lt; {{10}^{d}}\) has a prominent maximum in a range of \(q = 0.9{\kern 1pt} - {\kern 1pt} 1.0\). The number of young spectroscopic binaries with \(P &gt; {{10}^{d}}\) does not decrease with decreasing mass ratio as sharply as in the case of close binary stars, about 12% of these stars have \(q &lt; 0.5\). The paper is based on a talk presented at the astrophysical memorial seminar “Novelties in Understanding the Evolution of Binary Stars”, dedicated to the 90th anniversary of Professor M.A. Svechnikov.</p></abstract><trans-abstract xml:lang="ru"><p id="idm45257550532176">Собраны данные о 83 молодых спектрально-двойных звездах с двумя линиями в спектре, среди них – Ае/Ве звезды Хербига, звезды типа Т Тельца и красные карлики. Построены распределения молодых спектрально-двойных звезд по отношению масс компонентов и эксцентриситетам, диаграмма эксцентриситет–период и проведен их анализ. Подавляющее большинство короткопериодических систем с \(P &lt; {{10}^{d}}\) имеют эксцентриситеты, близкие к нулю. В этой группе практически нет молодых звезд с возрастом \(t \leqslant 1\) млн. лет. Распределение по отношению масс систем с \(P &lt; {{10}^{d}}\) имеет ярко выраженный максимум в интервале \(q = 0.9{\kern 1pt} - {\kern 1pt} 1.0\). У молодых спектрально-двойных звезд с \(P &gt; {{10}^{d}}\) распределение по отношению масс более пологое, около 12% имеют \(q &lt; 0.5\). Статья основана на докладе, сделанном на астрофизическом мемориальном семинаре “Новое в понимании эволюции двойных звезд”, приуроченном к 90-летию профессора М.А. Свечникова.</p></trans-abstract><kwd-group xml:lang="en"><kwd>pre-main sequence stars</kwd><kwd>spectroscopic binaries</kwd><kwd>mass ratio distribution</kwd><kwd>eccentricity distribution</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>молодые звезды</kwd><kwd>спектрально-двойные звезды</kwd><kwd>распределение по отношению масс</kwd><kwd>распределение по эксцентриситетам</kwd></kwd-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>З. Т. Крайчева, Е. И. Попова, А. В. Тутуков, Л. Р. Юн-гельсон, Научные информации Астрон. совета АН СССР 67, 3 (1989).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>З. Т. Крайчева, Е. И. Попова, А. В. Тутуков, Л. Р. Юн-гельсон, Астрофизика 30, 524 (1989).</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>V. Trimble, Monthly Not. Roy. Astron. Soc. 242, 79 (1990).</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>Н. З. Исмаилов, Г. А. Абди, Г. Б. 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