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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.
| The Lambda Orionis association
The Lambda Orionis association has the photometric properties of atypical young cluster with an age of about 4 million yr. Its distance is400 + or - 40 pc. Attention is drawn to the lack of a dense molecularcloud and associated infrared sources in this young grouping
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Observation and Astrometry data
| Constellation: | オリオン座 |
| Right ascension: | 05h36m23.08s |
| Declination: | +09°45'15.1" |
| Apparent magnitude: | 8.634 |
| Proper motion RA: | 2.7 |
| Proper motion Dec: | -9.2 |
| B-T magnitude: | 9.886 |
| V-T magnitude: | 8.738 |
Catalogs and designations:
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