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Star Structure of the Northern Part of the Orion Sword Region

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Abstract

According to the data of the Gaia DR3 catalogs, the belonging of the stars of group 189 ([1]), located in the northern part of the Orion Sword region, to the open star cluster (OSC) NGC 1977 was analyzed. To do this, the revision of the stellar composition of the northern part of the Orion Sword region (around the center of the OSC NGC 1977) was carried out using proper motions (PM) and parallaxes. At the same time, a part of the OSC NGC 1981, also located in the region under consideration, was captured. The presented catalog (n = 1041) includes candidate stars both in NGC 1977 and in NGC 1981 with the corresponding probabilities. The status of the stars of group 189 (Oricat 2836 and Oricat 2914) suggests their contribution to the X-ray radiation detected in this region. The question of the possible gravitational coupling of the NGC 1977–NGC 1981 pair is considered.

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ACKNOWLEDGMENTS

This work used data from the European Space Agency (ESA) Gaia mission (https://www.cosmos.esa.int/gaia) processed by the Gaia Data Processing and Analysis Consortium (DPAC, https://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for DPAC was provided by national institutions, in particular institutions participating in the Gaia Multilateral Agreement. Mission Gaia website: https://www.cosmos.esa.int/gaia. Gaia Archive website: https://archives.esac.esa.int/gaia. This study used the SIMBAD database (http://cds.u-strasbg.fr) operated by CDS, Strasbourg, France. The authors thank N.V. Kharchenko and A.E. Piskunov for useful advice and comments. The authors thank D.A. Mosunova for her help. The authors are grateful to the referees for their comments, which made it possible to improve the content of the work.

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  1. Institute of Astronomy of the Russian Academy of Sciences, 119017, Moscow, Russia

    S. V. Vereshchagin & N. V. Chupina

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  1. S. V. Vereshchagin
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  2. N. V. Chupina
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Correspondence to S. V. Vereshchagin.

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Translated by T. Sokolova

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Vereshchagin, S.V., Chupina, N.V. Star Structure of the Northern Part of the Orion Sword Region. Astron. Rep. 67, 336–392 (2023). https://doi.org/10.1134/S1063772923040042

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  • DOI: https://doi.org/10.1134/S1063772923040042

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