Model atmosphere and kinematical analyses of early-type stars from the Edinburgh–Cape Survey |
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| Authors: | HRM Magee PL Dufton FP Keenan WRJ Rolleston D Kilkenny D O'Donoghue C Koen RS Stobie |
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| Institution: | Department of Pure and Applied Physics, The Queen's University of Belfast, Belfast BT7 1NN;Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey RH5 6NT;South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa |
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| Abstract: | We present high-resolution spectroscopic observations of 21 B-type stars, selected from the Edinburgh–Cape Blue Object Survey. Model atmosphere analyses confirm that 14 of these stars are young, main-sequence B-type objects with Population I chemical compositions. The remaining seven are found to be evolved objects, including subdwarfs, horizontal branch and post-AGB objects. A kinematical analysis shows that all 14 young main-sequence stars could have formed in the disc and subsequently been ejected into the halo. These results are combined with the analysis of a previous subsample of stars taken from the Survey. Of the complete sample, 31 have been found to be young, main-sequence objects, with formation in the disc, and subsequent ejection into the halo, again being found to be a plausible scenario. |
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| Keywords: | stars: abundances stars: atmospheres stars: early-type stars: kinematics |
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