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Lithium in RS CVn binaries and related chromospherically active stars. I - Observational results
The present survey of the Li I 6708 A line in a sample of spectral typeG and K stars with luminosity classes III, IV, and V shows that manyK-type stars in the sample, including a large number of RS CVn binaries,show an anomalously high Li abundance relative to typical inactive starsof the same spectral type. Only a few stars in the sample are likely tobe premain sequence objects of stars which have recently arrived on themain sequence. Mechanisms that could lead to the enhanced Li absorptionin chromospherically active stars are discussed; these encompass largecool spots on the stellar surface, the production of Li in stellarflares by spallation reactions, and the evolution from main-sequenceprogenitors without, or with very shallow, outer convective zones.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Irmak |
| Sað Açýklýk: | 04h12m10.37s |
| Yükselim: | -30°26'11.6" |
| Görünürdeki Parlaklýk: | 8.134 |
| Uzaklýk: | 800 parsek |
| özdevim Sað Açýklýk: | 10.5 |
| özdevim Yükselim: | 8.4 |
| B-T magnitude: | 9.751 |
| V-T magnitude: | 8.268 |
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