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HD 13280


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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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관측 및 측정 데이터

별자리:불사조자리
적경:02h08m38.61s
적위:-43°16'02.4"
가시등급:8.785
거리:10000000 파섹
적경상의 고유운동:-4.8
적위상의 고유운동:-7.6
B-T magnitude:10.414
V-T magnitude:8.92

천체목록:
일반명   (Edit)
HD 1989HD 13280
TYCHO-2 2000TYC 7556-324-1
USNO-A2.0USNO-A2 0450-00736046
HIPHIP 9987

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