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Absorption in and around the H II region Lambda Orionis
Star counts were made, using the Cosmos measuring machine, in the fieldof the H II region excited by Lambda Orionis. These confirm thepreviously identified shell of absorption at the edge of the ionizedregion as well as a central core of absorption, and indicate thepossible presence of a second shell of absorption within the H IIregion, perhaps associated with the He II zone. The absorption radiallythrough the outer shell is 0.15 mag. Through the inner shell thisabsorption 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 expansionof the H II region, is 2000 solar masses. Only 30 solar masses of dustare left in the central core.
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Observation and Astrometry data
| Constellation: | Orion |
| Right ascension: | 05h35m25.34s |
| Declination: | +10°31'03.5" |
| Apparent magnitude: | 8.302 |
| Distance: | 342.466 parsecs |
| Proper motion RA: | 1.9 |
| Proper motion Dec: | -7.7 |
| B-T magnitude: | 8.39 |
| V-T magnitude: | 8.31 |
Catalogs and designations:
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