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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">647634</article-id><article-id pub-id-type="doi">10.31857/S0004629924060044</article-id><article-id pub-id-type="edn">JMKSFG</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">Long-term optical spectroscopy of B[e] star CI Cam in a quiet state</article-title><trans-title-group xml:lang="ru"><trans-title>Многолетняя оптическая спектроскопия B[e]-звезды CI Cam в спокойном состоянии</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Klochkova</surname><given-names>V. G.</given-names></name><name xml:lang="ru"><surname>Клочкова</surname><given-names>В. Г.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>Valentina.R11@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Miroshnichenko</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Мирошниченко</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="US">United States</country></address><email>Valentina.R11@yandex.ru</email><xref ref-type="aff" rid="aff2"/><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Panchuk</surname><given-names>V. E.</given-names></name><name xml:lang="ru"><surname>Панчук</surname><given-names>В. Е.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>Valentina.R11@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Special Astrophysical Observatory RAS</institution></aff><aff><institution xml:lang="ru">Специальная астрофизическая обсерватория Российской академии наук</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">University of North Carolina at Greensboro</institution></aff><aff><institution xml:lang="ru">Университет в Гринсборо</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Fesenkov Astrophysical Institute, Observatory</institution></aff><aff><institution xml:lang="ru">Астрофизический институт им. В. Г. Фесенкова</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-06-15" publication-format="electronic"><day>15</day><month>06</month><year>2024</year></pub-date><volume>101</volume><issue>6</issue><issue-title xml:lang="ru"/><fpage>536</fpage><lpage>549</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 ©; 2024, The Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Российская академия наук</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">The Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://journals.eco-vector.com/0004-6299/article/view/647634">https://journals.eco-vector.com/0004-6299/article/view/647634</self-uri><abstract xml:lang="en"><p>High-resolution optical spectra of the B[e] star CI Cam were obtained on arbitrary dates 2002–2023 using the 6-meter BTA telescope with the echelle spectrograph NES. The variability over time of the powerful emissions of H<sub>α</sub> and He I profiles is found. For two-peaked emissions with «rectangular» profiles, the intensity ratio of blue-shifted and red-shifted peaks is V / R ≥ 1 , except one date. A decrease in the intensity of all two-peak emissions with «rectangular» profiles was revealed as they moved away in time from the 1998 outburst. The average radial velocity for emissions of this type for all observation dates varies in the range V<sub>r</sub>(emis – d ) = –(50.8 – 55.7) + 0.2 km/s. The half-amplitude of the change (standard deviation) is equal to ∆V<sub>r</sub>= 2.5 km/s. The velocity for single-peaked ion emissions (Si III, Al III, Fe III) differs little from the values of V<sub>r</sub>(emis – d ) , but the measurement accuracy for these emissions is worse: the average error for different dates ranges from 0.4 to 1.3 km/s. The systemic velocity is assumed to be V<sub>sys</sub> = –55.4 + 0.6 km/s according to the stable position of the forbidden emission [N II] 5754 Å. The position of single-peak emissions [O III] 4959 and 5007 Å is also stable: V<sub>r</sub>([O III]) = –54.2 + 0.4 km/s. Emissions [O I] 5577, 6300, 6363 Å, [Ca II] 7291 and 7324 Å are absent from the spectra. Appearance of the emission near 4686 Å is an infrequent event, its intensity rarely exceeds the noise level. Only a wide asymmetric emission with an intensity of about 16% above the continuum was registered in the spectrum for 03.09.2015. Questions arise about the use of this emission to estimate the period of variability of the star and about localization of this feature in the CI Cam system. The photospheric absorptions of N II, S II, and Fe III with a variable position are identified.</p></abstract><trans-abstract xml:lang="ru"><p>Оптические спектры высокого разрешения B[e]-звезды CI Cam получены в разные даты 2002–2023 гг. на 6-метровом телескопе БТА с эшелле спектрографом НЭС. Найдена переменность во времени мощных эмиссионных профилей H<sub>α</sub> и He I. У двухпиковых эмиссий с «прямоугольными» профилями отношение интенсивности коротковолнового и длинноволнового пиков V / R ≥ 1 , за исключением одной даты. Выявлено снижение интенсивностей всех двухпиковых эмиссий с «прямоугольными» профилями по мере удаления во времени от вспышки 1998 г. Средняя лучевая скорость по эмиссиям этого типа для всех дат наблюдений изменяется в интервале V<sub>r</sub>(emis – d ) = –(50.8 ÷ 55.7) + 0.2 км/с. Полуамплитуда изменения скорости (среднеквадратичное уклонение) составляет ∆V<sub>r</sub> = 2.5 км/с. Скорость по однопиковым эмиссиям ионов (Si III, Al III, Fe III) мало отличается от значений V<sub>r</sub>(emis – d ), но точность измерений по этим эмиссиям хуже: ошибка среднего для разных дат меняется от 0.4 до 1.3 км/с. В качестве системной скорости принято значение V<sub>sys</sub> = –55.4 + 0.6 км/с по стабильному положению запрещенной эмиссии [N II] 5754 Å. Стабильно и положение однопиковых эмиссий [O III] 4959 и 5007 Å, V<sub>r</sub>(emis – d ) V<sub>r</sub>([O III]) = –54.2 + 0.4 км/с. Запрещенные эмиссии [O I] 5577, 6300, 6363 Å, [Ca II] 7291 и 7324 Å в спектрах отсутствуют. Эмиссия вблизи 4686 Å — нечастое событие, ее интенсивность редко превышает уровень шумов. Лишь в спектре, полученном 03.09.2015, зарегистрирована широкая асимметричная эмиссия с интенсивностью около 16٪ выше континуума. Возникают вопросы об использовании этой эмиссии для оценки периода переменности звезды и о локализации этой детали в системе CI Cam. Отождествлены фотосферные абсорбции N II, S II, Fe III с переменным положением.</p></trans-abstract><kwd-group xml:lang="en"><kwd>massive stars</kwd><kwd>binary systems</kwd><kwd>CI Cam</kwd><kwd>optical spectra</kwd><kwd>variability</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>массивные звезды</kwd><kwd>двойные системы</kwd><kwd>CI Cam</kwd><kwd>оптические спектры</kwd><kwd>переменность</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="ru">Российский научный фонд</institution></institution-wrap><institution-wrap><institution xml:lang="en">Russian Science Foundation</institution></institution-wrap></funding-source><award-id>22-12-00069</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>P. W. Merrill and C. G. Burwell, 78, 87 (1933).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>J. S. Clark, A. S. Miroshnichenko, V. M. 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