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A Search for Lithium-Rich Giants among Stars with Infrared Excesses
The unusual nature of the single, rapidly rotating, lithium-rich K giantHDE 233517, which is currently undergoing significant mass loss,prompted a search for giants with similar properties. High-dispersionspectroscopic observations were obtained of HD 219025, a knownlithium-rich infrared-excess giant, plus 39 stars from a list of G and Kgiants with excess far-infrared emission. The projected rotationalvelocities of the vast majority of infrared-excess giants appear to besimilar to those of normal G and K giants. Six giants have lithiumabundances at or above theoretical upper envelope values. The percentageof such stars in the sample of 39 infrared-excess giants is similar tothat of normal giants. The three giants with the largest lithiumabundances have previously been discovered. None of the sample of 39giants have an Hα line similar to the broadened and veryasymmetric line of HDE 233517. The star with optical properties mostsimilar to HDE 233517 is HD 219025.
| Luminosity Class III Stars with Excess Far-Infrared Emission
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1995ApJ...446L..79Z&db_key=AST
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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Mikroskop |
| Sað Açýklýk: | 21h27m15.86s |
| Yükselim: | -34°54'10.6" |
| Görünürdeki Parlaklýk: | 8.004 |
| Uzaklýk: | 4761.905 parsek |
| özdevim Sað Açýklýk: | 5 |
| özdevim Yükselim: | -28 |
| B-T magnitude: | 9.853 |
| V-T magnitude: | 8.157 |
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