Spectrophotometry of peculiar B and A stars. II - Eleven mercury-manganese stars

Astronomy and Astrophysics – Astronomy

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A Stars, B Stars, Manganese, Mercury (Metal), Metallic Stars, Stellar Spectrophotometry, Abundance, Energy Distribution, Stellar Atmospheres, Stellar Models, Stellar Temperature, Tables (Data)

Scientific paper

Spectrophotometry of eleven HgMn stars is presented for the optical region. The HgMn stars have systematically larger values of two synthesized indices than the normal main-sequence stars due to differences with respect to the mean continuum, particularly of the 4464-A values and the 5200-A region, respectively. The HgMn stars exhibit a continuous range in the behavior of both the 4200-and 5200-A regions between those stars that have index values larger than the appropriate criterion of presence and present definite evidence for the features to those stars with only a slight possibility of such features. The strengths of the 4200- and 5200-A features appear not to be correlated. In the HgMn stars, both features may be due to differental line blocking. In the energy distribution of all eleven stars, the Balmer jump regions best fit the predictions of slightly hotter solar composition, log g = 4.0, fully line blanketed model atmospheres than do the corresponding Paschen continua.

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