摘要
1989年12月7、8及11日,本文作者在北京天文台兴隆观测站用60cm望远镜,60/90/180cm施米特望远镜和1.26m红外望远镜同时对Be星48Per进行了快变联合观测.观测结果表明:巴耳末线H_β中心发射强度和观测的红外星等均有变化.根据48Per在远红外(12,25和60μ) Be星的观测双色图上所处位置以及红外理论模型,我们得出如下结论:当前围绕在该星周围的包层是不稳定的,并且与1981—1983年的光谱比较,发现H_β发射相对于连续谱有了显著增强.因此认为目前这一不稳定状态可能是前面活动的继续.
The spectroscopic and photometric data of 48 Per in the visible and near infrared regions were obtained on December 7,8 and 11, 1989. The observations were made with the 60cm,90cm and 126cm telescopes at Xinglong Station of Beijing Astronomical Observatory. The results obtained show that there were rapid variations in the strength of H_β emission line with at time scale of about 30 minutes and changeable trend of infrared magnitude at around UT 16~h.1 to 16~h.5 on December 7, 1989. In terms of the far 1R colour-colour diagram of Be stars obtained at 12,25 and 60μm (Cote et al, 1986) and the theoretical model (Arati et al, 1978) in infrared band, we conclude that the envelooe around 48 Per is unstable. Finally, compared with Goraya's spectral scans of 48 Per, we found that the intensities of H_β emission had increased obviously. So we draw the conclusion that the present state is appears to be the continuation of the previous active variability.
出处
《天文学报》
CSCD
北大核心
1991年第4期415-420,共6页
Acta Astronomica Sinica
基金
国家自然科学基金
