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Additional late-type stars with technetium
The results of a survey of 279 late-type giants and supergiants for thespectral lines of the radioactive element technetium (Tc I) at 4297,4262, and 4238 A are presented. The following conclusions are reached:(1) the presence of Tc correlates very strongly with the existence oflight variability; (2) evolutionary MS stars show Tc and spectroscopicMS stars do not show Tc; (3) single S stars show Tc; (4) SC stars showTc; (5) about 75 percent of the C stars show Tc; and (6) Ba II stars donot show Tc. The findings are compatible with predictions from stellarevolution theory.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Avci |
| Sað Açýklýk: | 06h25m21.52s |
| Yükselim: | +10°48'32.3" |
| Görünürdeki Parlaklýk: | 7.403 |
| özdevim Sað Açýklýk: | -0.9 |
| özdevim Yükselim: | -0.4 |
| B-T magnitude: | 7.309 |
| V-T magnitude: | 7.396 |
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