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Table E.1

Gaia EDR3 parallaxes and photometric and astrometric measurements for massive stars in the open cluster NGC 457.

Name ϖ(mas) µα(masyr−1) µδ(masyr−1) G(mag) RUWE
HD 7927 0.2142 ± 0.0838 −1.479 ± 0.056 −1.231 ± 0.068 4.7361 0.92
HD 7902 0.3679 ± 0.0169 −1.560 ± 0.013 −0.809 ± 0.016 6.8426 0.92
HD 236697 0.3102 ± 0.0182 −1.730 ± 0.012 −0.780 ± 0.015 7.5056 0.87
BD +57 243 0.3335 ± 0.0122 −1.577 ± 0.009 −0.860 ± 0.011 9.2586 0.97
BD +57 252 0.3179 ± 0.0134 −1.621 ± 0.009 −0.783 ± 0.011 9.4132 0.88
HD 236689 0.3501 ± 0.0147 −1.762 ± 0.010 −0.779 ± 0.012 9.4658 0.95
BD +57 249 0.3402 ± 0.0133 −1.691 ± 0.010 −0.744 ± 0.011 9.7400 0.90
BD +57 247 0.2883 ± 0.0182 −1.728 ± 0.013 −0.935 ± 0.017 9.8529 0.94

Notes. The names of objects used for the distance estimate of the cluster are in bold. We rejected HD 7927 and BD +57 247 based on the parallax.

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