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Stellar groups and clusters in the region of Orion's Sword
The region of Orion’s Sword with coordinates ? = 83.79°,? = ?5.20° and a size of 1.0° × 2.5° isanalyzed. We compiled a master catalog of stars observed in the optical,containing positions, proper motions, and UBV photometry for 1634 stars.Using the nearest-neighbor-distance technique, we subdivided the regioninto stellar groups with different numbers of members. The positions offive groups coincide with known clusters, and two groups coincide withaggregates of stars with H? emission. We have identified groupswith low membership that are moving away from the system. We alsoconsidered the kinematic structure of the groups using the AD-diagrammethod we developed earlier. Most of the stellar clusters and groupsdisplay similar kinematics, with the exception of the group OMC-2, whichis moving toward its own apex. We also confirmed the existence of thekinematic star group 189 discovered earlier; its position is close tothe cluster NGC 1977, and it is probably a component of its corona.
| Walraven photometry of nearby southern OB associations
Homogeneous Walraven (VBLUW) photometry is presented for 5260 stars inthe regions of five nearby southern OB associations: Scorpio Centaurus(Sco OB2), Orion OB1, Canis Major OB1, Monoceros OB1, and Scutum OB2.Derived V and (B - V) in the Johnson system are included.
| UVBY photometry of wide visual double stars. III
The observed magnitudes and color indices b-y, m1, and c1 are obtainedfor the components of 31 visual double stars and one triple system. Theabsolute magnitudes of the components are calculated, and the physicalcharacteristics of the systems are examined.
| UVBY observations of A, F, G and K field stars
Photoelectric data in the uvby system have been obtained for about 800southern stars of the Hipparcos Input Catalog (Grenon, 1982, 1985). Mostof the stars are F and G main sequence and fall in the magnitude range V= 8-11.
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