Spectroscopic studies of stars in ORI OB1 /Belt/

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A Stars, B Stars, Orion Constellation, Stellar Spectra, Stellar Spectrophotometry, Classifications, Distance, Hertzsprung-Russell Diagram, Main Sequence Stars, Stellar Evolution, Stellar Rotation, Subgiant Stars

Scientific paper

MK spectral classifications are presented for 120 B- and A-type stars in the Belt subgroup of the Ori OB1 association. Combined with other published spectroscopic data, and the assumed absolute magnitudes given by Schmidt-Kaler (1965) and Lesh (1979), a mean corrected distance modulus of 8.56 + or - 0.11 is computed for the eastern region, while for the remainder of the Belt a modulus of 8.20 + or - 0.05 is derived. Several B9-A2 subgiants and A7-F0 main-sequence stars were observed in the western and central regions of the Belt. The ages of these stars imply a spread in formation ages for these subgroups from about 1 million yr to at least 10 million yr.

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