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Lithium abundances and rotational behavior for bright giant stars
Aims.We study the links possibly existing between the lithium content ofbright giant stars and their rotational velocity. Methods: .Weperformed a spectral analysis of 145 bright giant stars (luminosityclass II) spanning the spectral range from F3 to K5. All these starshave homogeneous rotational velocity measurements available in theliterature. Results: .For all the stars of the sample, we provideconsistent lithium abundances (A_Li), effective temperatures (T_eff),projected rotational velocity (v sin i), mean metallicity ([Fe/H]),stellar mass, and an indication of the stellar multiplicity. The gradualdecrease in lithium abundance with T_eff is confirmed for bright giantstars, and it points to a dilution factor that is at least assignificant as in giant stars. From the F to K spectral types, the A_Lispans at least three orders of magnitude, reflecting the effects ofstellar mass and evolution on dilution. Conclusions: .We find thatthe behavior of A_Li as a function of v sin i in bright giant starspresents the same trend as is observed in giants and subgiants: starswith high A_Li are moderate or fast rotators, while stars with low A_Lishow a wide range of v sin i values.
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Agcik |
| Sað Açýklýk: | 03h28m38.76s |
| Yükselim: | -61°11'22.3" |
| Görünürdeki Parlaklýk: | 8.333 |
| Uzaklýk: | 230.415 parsek |
| özdevim Sað Açýklýk: | 10.8 |
| özdevim Yükselim: | 2.8 |
| B-T magnitude: | 9.836 |
| V-T magnitude: | 8.458 |
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