Absorption in and around the H II region Lambda Orionis

Details Absorption in and around the H II region Lambda Orionis Absorption in and around the H II region Lambda Orionis

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.184..171c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 184, July 1978, p. 171-180.

Astronomy and Astrophysics

Astronomy

11

Astronomical Photography, Electromagnetic Absorption, H Ii Regions, Nebulae, Cosmic Dust, Orion Constellation, Photographic Plates, Space Density, Star Distribution, Tables (Data)

Scientific paper

Star counts were made, using the Cosmos measuring machine, in the field of the H II region excited by Lambda Orionis. These confirm the previously identified shell of absorption at the edge of the ionized region as well as a central core of absorption, and indicate the possible presence of a second shell of absorption within the H II region, perhaps associated with the He II zone. The absorption radially through the outer shell is 0.15 mag. Through the inner shell this absorption is 0.15 mag and along a radius of the central core, 0.35 mag. The mass of the dust in the outer shell, said to be formed by expansion of the H II region, is 2000 solar masses. Only 30 solar masses of dust are left in the central core.

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