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HD 36913


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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:Ωρίων
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:
Proper Names   (Edit)
HD 1989HD 36913
TYCHO-2 2000TYC 705-309-1
USNO-A2.0USNO-A2 0975-01748247
HIPHIP 26239

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