| タイトル | A spectroscopic, photometric, and magnetic study of the starspot on II Pegasi |
| 著者（英） | Vogt, S. S. |
| 著者所属（英） | Lick Observatory |
| 発行日 | 1981-08-01 |
| 言語 | eng |
| 内容記述 | A description is presented of extensive observations of II Peg during 1977 and 1978, taking into account multicolor broad-band photometry, high-dispersion spectroscopy, low-dispersion spectrophotometry, and Zeeman analysis. During this time the star showed periodic light variations in excess of a 0.4 mag range attributable to the presence of a large starspot or an equivalent nonuniform surface brightness distribution. The high-precision multicolor photometry, which differed greatly from previous photometric results, illustrates that the starspots on II Peg are continually evolving on time scales of approximately 1 year or less. A low-dispersion spectrum of the large spot showed pronounced VO and TiO molecular adsorption features. A high-resolution, high signal-to-noise Reticon spectrum at lambda 6707 does not show any compelling evidence of previously reported lithium in this star. |
| NASA分類 | ASTRONOMY |
| レポートNO | 81A45996 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/415242 |
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