Study of a triple emission nebula in Orion

Details Study of a triple emission nebula in Orion Study of a triple emission nebula in Orion

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976ap%26ss..45...79p&link_type=abstract

Astrophysics and Space Science, vol. 45, Nov. 1976, p. 79-85.

Astronomy and Astrophysics

Astrophysics

14

H Alpha Line, Nebulae, Radial Velocity, Fabry-Perot Interferometers, H Ii Regions, Interstellar Extinction, Stellar Spectrophotometry, Ubv Spectra

Scientific paper

The H II regions S254, 255, and 257 in the constellation Orion are close together on the sky and appear like a triple object. Fabry-Perot radial velocities of the H II regions as well as UBV photoelectric 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; and (3) S255, identified as an IR and a molecular source, is the youngest object of the group. It is concluded that the three H II regions are at different evolutionary stages.

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