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HD 26045


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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:Kilicbaligi
Sað Açýklýk:04h04m28.50s
Yükselim:-55°47'49.9"
Görünürdeki Parlaklýk:8.879
Uzaklýk:628.931 parsek
özdevim Sað Açýklýk:4.2
özdevim Yükselim:2.1
B-T magnitude:10.507
V-T magnitude:9.014

Kataloglar ve belirtme:
Özgün isimleri
HD 1989HD 26045
TYCHO-2 2000TYC 8504-327-1
USNO-A2.0USNO-A2 0300-01216555
HIPHIP 19020

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