| タイトル | Variations in the UV spectrum of a Centauri |
| 本文（外部サイト） | http://hdl.handle.net/2060/19810017379 |
| 著者（英） | Fahey, R. P. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 1981-01-01 |
| 言語 | eng |
| 内容記述 | Equivalent width and central depth measurements of the ultraviolet absorption lines from the spectrum of the He I variable star a Cen HD 125823 are presented. The measurements are from 53 short wavelength, and 45 long wavelength, high resolution spectrographs taken with the IUE satellite over a 25 day period during July and August of 1978. Central depth measurements were of lines of Cr III, Mn III, V III, C III, Si II, and S II seen in the region between 1245 and 1255 A. Equivalent widths are of the three He I 2(3)s-n(3po) transitions found at 2945, 2829 and 2764 A. The period for cyclic intensity variations in He I is determined using a four parameter, least squares fit to a sinusoid. The IUE observations match both a period of 8.8163 + or - 0.0003 days and a previously unreported period of 9.2532 + or - 0.0003 days with equal minima for the least squares fit. The phase of Cr III maximum relative to He I maximum is found to be 0.53 cycles for the IUE observations. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 81N25915 |
| 権利 | No Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/568164 |
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