| タイトル | Evidence for processed material in the atmospheres of Large Magellanic Cloud B supergiants |
| 著者（英） | Fitzpatrick, Edward L.; Bohannan, Bruce |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1993-02-20 |
| 言語 | eng |
| 内容記述 | We present a high-dispersion study of the optical spectra of 11 LMC B-type supergiants. These stars had been shown previously to have a wide range in nitrogen absorption line strengths, despite having very similar temperatures and luminosities. The current study shows that the relatively rare nitrogen-weak stars also have weaker photospheric helium lines and stronger photospheric oxygen lines than the more spectroscopically typical supergiants. This pattern suggests that the vast majority of LMC B-type supergiants have had their surfaces contaminated by material from their original hydrogen-burning cores - with a resultant enhancement of surface nitrogen and helium and a depletion in oxygen - while the spectroscopically nitrogen-weak stars are more likely to have retained their main-sequence surface abundances. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 93A29209 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/319461 |
