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Rotational velocity for lithium-rich evolved stars.
Precise rotational velocities have been determined for 12 lithium-richgiant stars using the CORAVEL spectrometer. Except for HD 9746, thelithium-rich giants show normal rotational velocities with respect totypical lithium-normal giants of the same spectral type. Further, wehave found no sign of binarity for the lithium-rich giants.
| Analysis of the moderately Li-rich giant HD 146850.
We report the identification of 3 Li-rich giants discovered in anongoing survey based on IRAS colours. A detailed analysis of one ofthese, HD 146850, is presented here. High-resolution spectra wereobtained for this star, using CASPEC at the 3.6m telescope of ESO. Wederived the stellar parameters (T_eff_, log g, [M/H])=4000, 1.5, -0.3. Alithium abundance of ɛ(Li)=1.6 is found, whereas [C/Fe]~0.0 and[N/Fe]~-0.1 indicating that no convective mixing has occurred. Theabundances of oxygen [O/Fe]=~+0.1 and α-elements[Mg/Fe]=[Ti/Fe]=[Ca/Fe]=~0.0 suggest that we are dealing with a diskstar, for which the radial velocity v_r_=42km/s is also moderate.
| CNO Abundances and 12/C/13/C Ratios in the Atmospheres of Lithium-Rich Giants
Not Available
| Turbulence and the Lithium Abundance in Giants and Main-Sequence Disk and Halo Stars
Not Available
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Zurafa |
| Sað Açýklýk: | 05h57m04.24s |
| Yükselim: | +57°19'27.9" |
| Görünürdeki Parlaklýk: | 8.266 |
| Uzaklýk: | 206.612 parsek |
| özdevim Sað Açýklýk: | -14.5 |
| özdevim Yükselim: | -7.9 |
| B-T magnitude: | 9.414 |
| V-T magnitude: | 8.361 |
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