两颗IIn型超新星的观测研究(英文)  

Observations and Data Analyses of Two Type-IIn Supernovae

作　　者：王晓伟[1] 徐栋[2] 魏建彦[1] 邓劲松[1] 吴潮[1] 张天萌[1] 黎华丽[1] 黄芳[3] 

机构地区：[1]中国科学院国家天文台,北京100012 [2]哥本哈根大学尼尔斯.玻尔研究所 [3]北京师范大学天文系,北京100875

出　　处：《天文研究与技术》2014年第2期102-110,共9页Astronomical Research & Technology

摘　　要：介绍了PTF10gvf和PTF10gvd两颗Ⅱn型超新星的测光和光谱的观测情况,并对这两颗超新星做了精确测光和光谱拟合.通过对光谱的分析,得到这两颗超新星的抛射物的外层激波速度为～103 km/s,其前身星的星风速度为～102 km/s,并根据Chugai＆amp;Danziger （1994）提出的方法计算了它们的前身星质量损失率.PTF10gvf的质量损失率为～10-2M⊙/yr,PTF10gvd的质量损失率为～10-4M⊙/yr.由于这些物理参数与亮蓝变星星风速度和质量损失率的典型值相符合,推测这两颗Ⅱn型超新星的前身星有可能是亮蓝变星.这个结论为Ⅱn超新星与亮蓝变星之间的联系提供了支持,与之前Gal-Yam A V等人得到的结果一致.In this paper we present the analyses of data of certain spectroscopic and photometric observations of two Type-IIn supernovae, the PTF10gvd and PTFlOgvf. We decomposed their Ha emission-line profiles into two or three Gaussian components. From our measurements of the FWHM values of the narrow and intermediate-width components of the Hot emission-line profiles, we derived the wind velocity and the shock-wave velocity of each of the two supernovae to be - 102k^m/s and -10^3km/s, respectively. We estimated the mass loss rates of the progenitors of the supernovae using the method of Chugai ＆ Danziger （1994）. The estimated mass loss rates are - 10^-2 Mo/yr and -10^-4 Mo/yr for the PTF10gvf and the PTF10gvd, respectively. Based on the results we infer that the progenitors of the two supernovae are Luminous Blue Variables （LBVs） , which supports the work of A. V. Gal-Yam ＆ D. C. Leonard （2009）.

关 键 词：超新星 前身星 质量损失率 光谱拟合 

分 类 号：P144.1[天文地球—天体物理]