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Table 3.

Group proper motions in α* and δ derived in this work and those from the Villafranca II and III works, all based on Gaia EDR3 astrometry.

This work Villafranca II-III

Group N μα * ,g μδ, g μα * ,g μδ, g
O-002 (Trumpler 14) 32 −6.580 ± 0.240 2.089 ± 0.246 −6.534 ± 0.023 2.076 ± 0.023
O-003 (Trumpler 16 W) 8 −7.179 ± 0.102 2.730 ± 0.103 −7.128 ± 0.024 2.670 ± 0.024
O-025 (Trumpler 16 E) 47 −6.894 ± 0.214 2.647 ± 0.177 −6.877 ± 0.023 2.596 ± 0.023
O-027 (Trumpler 15) 17 −6.172 ± 0.164 2.224 ± 0.175 −6.282 ± 0.023 2.131 ± 0.023
O-028 (Collinder 228) 53 −6.896 ± 0.334 2.332 ± 0.396 −6.713 ± 0.021 2.070 ± 0.021
O-029 (Collinder 232) 12 −6.667 ± 0.414 2.238 ± 0.294 −6.552 ± 0.023 2.142 ± 0.023
O-030 (Bochum 11) 19 −6.559 ± 0.204 2.328 ± 0.307 −6.635 ± 0.021 2.279 ± 0.021

Notes. Group uncertainties reported in this work refer to the standard deviation of the selected OB stars while those in Villafranca II-III correspond to the standard deviation of the mean (with the angular covariance term included) of all the stars identified as group members, a much larger number than the one used in this work.

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