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Study of a triple emission nebula in Orion

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Abstract

The Hii regions S254, 255 and 257 in the constellation of Orion are close together on the sky and appear like a triple object. Fabry-Pérot radial velocities of the Hii regions as well asUBV photo-electric magnitudes of their exciting stars are obtained. The data show that (1) all three nebulae are at a distance of 2.5 kpc; (2) an excess extinction is observed in S255 and S257 while S254 shows no excess extinction; (3) S255, identified as an IR and a molecular source, is the youngest object of the group. It is concluded that the three Hii regions are at different evolutionary stages.

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Authors and Affiliations

  1. Instituto de Astronomía, Universidad Nacional Autónoma de México, Mexico

    Paris Pişmiş & Ilse Hasse

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  1. Paris Pişmiş
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  2. Ilse Hasse
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Pişmiş, P., Hasse, I. Study of a triple emission nebula in Orion. Astrophys Space Sci 45, 79–85 (1976). https://doi.org/10.1007/BF00642143

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  • DOI: https://doi.org/10.1007/BF00642143

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