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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">647689</article-id><article-id pub-id-type="doi">10.31857/S0004629924120074</article-id><article-id pub-id-type="edn">ICKCOZ</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">Search for pulsars with periods of more than two seconds at declinations from +21◦ to +42◦</article-title><trans-title-group xml:lang="ru"><trans-title>Поиск долгопериодических транзиентов с периодами больше двух секунд на склонениях от +21◦ до +42◦</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tyul’bashev</surname><given-names>S. A.</given-names></name><name xml:lang="ru"><surname>Тюльбашев</surname><given-names>С. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Astro-Space center, Pushchino radio astronomy observatory</p></bio><bio xml:lang="ru"><p>Астрокосмический центр, Пущинская радиоастрономическая обсерватория</p></bio><email>serg@prao.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tyul’basheva</surname><given-names>G. E.</given-names></name><name xml:lang="ru"><surname>Тюльбашева</surname><given-names>Г. Э.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>serg@prao.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Lebedev Physical Institute</institution></aff><aff><institution xml:lang="ru">Физический институт им. П. Н. Лебедева</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Institute of Mathematical Problems of Biology RAS (IMPB RAS), branch of Keldysh Institute of Applied Mathematics of Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт математических проблем биологии Российской академии наук, филиал Института прикладной математики им. М. В. Келдыша РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-15" publication-format="electronic"><day>15</day><month>12</month><year>2024</year></pub-date><volume>101</volume><issue>12</issue><fpage>1095</fpage><lpage>1106</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/647689">https://journals.eco-vector.com/0004-6299/article/view/647689</self-uri><abstract xml:lang="en"><p>The search for long period transients with periods (<italic>P</italic>) from 2 to 90 s was carried out in daily observations conducted in a area 6300 sq. deg.. The data was obtained on a Large Phased Array (LPA) at a frequency of 111 MHz. Periodograms calculated using the Fast Folding Algorithm (FFA) were used for the search. To increase the sensitivity, the periodograms obtained in different observation sessions were added. Of the 14 known pulsars that entered the study area, having periods <italic>P</italic> &gt; 2 c and dispersion measures (<italic>DM</italic>) less than 200 pc/cm<sup>3</sup>, 9 were detected. Two new pulsars were found. The average profiles of pulsars are obtained and estimates of their flux density are given. The discovered pulsar J1951+28, with a period of <italic>P</italic> = 7.3342 s and <italic>DM</italic> = 3.5 pc/cm<sup>3</sup>, turned out to be one of the closest pulsars to the Sun. The absence of new long period transients (pulsars or white dwarf) with periods of tens of seconds with the achieved sensitivity of searching for 1 mJy outside the galactic plane indicates a low probability of the existence of pulsars of neutron stars with extremely long periods. Most likely, the recently found sources of periodic radiation with periods from a minute to tens of minutes are white dwarfs pulsars.</p></abstract><trans-abstract xml:lang="ru"><p>Проведен поиск долгопериодических транзиентов с периодами <italic>P</italic> от 2 до 90 с в ежедневных наблюдениях, проводимых на интервале 5 лет в площадке размером 6300 кв. град. Данные получены на Большой синфазной антенне (БСА) на частоте 111 МГц. Для поиска использовались периодограммы, построенные с помощью алгоритма быстрого суммирования (FFA; Fast Folding Algorithm). Для увеличения чувствительности, периодограммы, полученные в разных наблюдательных сессиях, складывались. Из 14 известных пульсаров, попавших в исследуемую площадку и имеющих периоды <italic>P</italic> &gt; 2 c и меры дисперсии <italic>DM</italic> &lt; 200 пк/см<sup>3</sup>, обнаружены 9 объектов, известных по каталогу ATNF. Найдены 2 новых пульсара. Получены средние профили пульсаров и даны оценки их плотностей потоков. Открытый пульсар J1951+28, имеющий период <italic>P</italic> = 7.3342 c и <italic>DM</italic> = 3–4 пк/см<sup>3</sup>, оказался одним из самых близких к Солнцу пульсаров в северном полушарии. Отсутствие новых долгопериодических транзиентов (пульсаров или белых карликов), имеющих периоды десятки секунд при достигнутой чувствительности поиска 1 мЯн вне галактической плоскости, говорит о низкой вероятности существования пульсаров–нейтронных звезд с экстремально большими периодами. Вероятнее всего, недавно найденные источники периодического излучения с периодами от минуты до десятков минут являются белыми карликами.</p></trans-abstract><kwd-group xml:lang="en"><kwd>pulsar search</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>поиск пульсаров</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>22-12-00236</award-id></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>A. Hewish, S. J. Bell, J.D.H. Pilkington, P. F. Scott, and R. A. Collins, Nature 217(5130), 709 (1968).</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>R.V.E. Lovelace and H. D. 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