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Beryllium abundances in the lithium-deficient Hyades F stars
Spectra of the Be II doublet at 3130.4 and 3131.1 A have been obtainedin eight Hyades F dwarfs, including stars in the Hyades Li gap found byBoesgaard and Trippico (1986). Abundances were determined in thestandard way, but a 'differential spectroscopy' procedure was also usedwhich involved comparing the Hyades stars with a standard star via aleast-squares algorithm to give the best fit between the object andstandard spectra in the region immediately around the Be doublet. Thisprocedure was adapted to rapidly rotating stars by convolving with thestandard spectrum with a rotation profile of the correct width. Asynthesis of the spectrum was done also with 20 spectral lines in theregion of the Be blend. There is virtually no change in the Be contentin those stars across the temperature region where there is a largedeficiency in Li. The Be/H values are about 10 to the -11th, near thesolar value of 1.4 x 10 to the -11th.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Irmak |
| Sað Açýklýk: | 04h28m31.33s |
| Yükselim: | -07°33'08.5" |
| Görünürdeki Parlaklýk: | 8.012 |
| Uzaklýk: | 73.801 parsek |
| özdevim Sað Açýklýk: | 62.5 |
| özdevim Yükselim: | 126.3 |
| B-T magnitude: | 8.602 |
| V-T magnitude: | 8.061 |
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