Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..723b&link_type=abstract
Astrophysical Journal, Part 1, vol. 259, Aug. 15, 1982, p. 723-729. Research supported by the Observatoire de Paris
Astronomy and Astrophysics
Astrophysics
14
A Stars, Abundance, Beryllium, Metallic Stars, Peculiar Stars, Stellar Temperature, Atmospheric Models, Radiation Pressure, Stellar Atmospheres, Temperature Dependence
Scientific paper
The Hg-Mn stars show anomalous line strengths of many chemical elements including Be. The Be II resonance doublet has been observed at 3130, 3131 A at 6.7 A/mm in 43 Hg-Mn stars and 10 normal stars in the same temperature range with the coude spectrograph of the 2.24 m University of Hawaii telescope at Mauna Kea. Measured equivalent widths of the two lines and/or the blend of the doublet have been compared with the predictions from (1) LTE model atmospheres and (2) non-LTE line formation in non-LTE model atmospheres. Overabundances of factors of 20-20,000 relative to solar have been found for 75 percent of the Hg-Mn stars. The 25 percent with little or no Be are typically among the cooler Hg-Mn stars, but for the stars with Be excesses, there is only marginal evidence for a correlation of the size of the overabundance and temperature. It is suggested that diffusion driven by radiation pressure is responsible for the observed Be abundance anomalies.
Boesgaard Ann Merchant
Borsenberger J.
Heacox William D.
Praderie Francoise
Wolff Sidney C.
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