Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...261..135d&link_type=abstract
Astrophysical Journal, Part 1, vol. 261, Oct. 1, 1982, p. 135-150.
Astronomy and Astrophysics
Astrophysics
106
Early Stars, H Alpha Line, Molecular Clouds, Orion Constellation, Star Formation, Astronomical Photometry, B Stars, H Ii Regions, O Stars, Spatial Distribution, T Tauri Stars
Scientific paper
The results are presented of the first thoroughly sampled survey of the entire Lambda Orionis region for alpha hydrogen emission objects, and photographic photometry is presented of the entire list of previously known and newly discovered such objects. The majority of the objects are not projected against dark cloud material, and many appear to be within the central regions of the extended low density H II region excited by Lambda Orionis. The vast majority of the objects form an elongated, barlike structure two by eight degrees in extent. It is concluded that Lambda Orionis is an important region for studies of star formation. The complex is in an intermediate stage of disruption; the expanding H II region has displaced most of the gaseous mass. The young stars have apparently not moved very far from their original locations and thus provide a fossil record of the original cloud structure.
Duerr R.
Imhoff Catherine L.
Lada Charles J.
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