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Stellar groups and clusters in the region of Orion’s Sword

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Abstract

The region of Orion’s Sword with coordinates α = 83.79°, δ = −5.20° and a size of 1.0° × 2.5° is analyzed. We compiled a master catalog of stars observed in the optical, containing positions, proper motions, and UBV photometry for 1634 stars. Using the nearest-neighbor-distance technique, we subdivided the region into stellar groups with different numbers of members. The positions of five groups coincide with known clusters, and two groups coincide with aggregates of stars with Hα emission. We have identified groups with low membership that are moving away from the system. We also considered the kinematic structure of the groups using the AD-diagram method we developed earlier. Most of the stellar clusters and groups display similar kinematics, with the exception of the group OMC-2, which is moving toward its own apex. We also confirmed the existence of the kinematic star group 189 discovered earlier; its position is close to the cluster NGC 1977, and it is probably a component of its corona.

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Authors and Affiliations

  1. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, 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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Original Russian Text © S.V. Vereshchagin, N.V. Chupina, 2010, published in Astronomicheskiĭ Zhurnal, 2010, Vol. 87, No. 9, pp. 853–866.

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Vereshchagin, S.V., Chupina, N.V. Stellar groups and clusters in the region of Orion’s Sword. Astron. Rep. 54, 784–796 (2010). https://doi.org/10.1134/S1063772910090039

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