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- W2152463075 abstract "Atmospheric parameters and surface chemical com- positions are presented for eight stars, classified as B1 or B2 but with a range of luminosity classes, in the northern double cluster h and Persei. Echelle spectroscopy (covering the wave- length region 3900 to 4700 ˚ A) and grating spectroscopy (of the Balmer, H and H lines) were analysed using non-LTE syn- thetic spectra based on LTE line-blanketed atmosphere struc- tures. High microturbulences are found in our sample, and this quantity must be included in the computation of the non-LTE level populations; its effect is generally to decrease the derived metal abundances by typically 0.1 dex but by up to 0.4 dex. Our absolute abundances are in reasonable agreement with those previously found for main sequence B-type stars, while we find some evidence for small abundance variations (particularly for nitrogen) within our sample. One star (BD+56 678) appears to be a spectrum variable and at two epochs shows a highly en- riched nitrogen spectrum. Our atmospheric parameters imply that two stars have previously been mis-identified as main se- quence objects and a distance modulus, at the higher end of the values previously deduced. The observational HR diagram is consistent with stellar evolutionary models that explicitly in- clude the effects of rotation." @default.
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- W2152463075 date "2000-06-01" @default.
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- W2152463075 title "The atmospheric parameters and chemical composition of early B-type giants in h and chi Persei" @default.
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