A New Channel to Type Ia Supernovae: White Dwarf+Helium Star Systems

摘要：

We have systematically studied the He star donor channel for type Ia su pemova (SN Ia) progenitors, in which a carbon-oxygen white dwarf (CO WD) accretes material from a He main sequence star or a He subgiant to increase its mass to the Chandrasekhar mass. Employing Eggletons stellar evolution code, we performed bi nary evolution calculations for about 2600 close WD binary systems and mapped out the parameter spaces for producing SNe la. We have incorporated these results into a binary population synthesis code to obtain SN la birthrates. Although the Galactic birthrates from this channel are low (～ 0.3 x 10-3 yr-l), the He star donor channel can explain SNe Ia with short delay times (≤ 108 yr).

关键词： stars evolution supernovae general white dwarfs

作者: B. Wang X. Meng X. Chen Z. Han

作者单位: National Astronomical Observatories/Yunnan Observatory,the Chinese Academy of Sciences, Kunming,650 Department of Physics and Chemistry, Henan Polytechnic University, Jiaozuo 454003, China National Astronomical Observatories/Yunnan Observatory,the Chinese Academy of Sciences, Kunming,650 National Astronomical Observatories/Yunnan Observatory,the Chinese Academy of Sciences, Kunming, 65

会议类型: 国际会议

会议名称: The 10th Asian-Pacific Regional International Astronomical Union Meeting(第十届亚洲及太平洋地区天文学大会 APRIM)

会议地点: 昆明

会议语种:英文

页码: 172-173

在线出版日期: 2008-08-03（万方平台首次上网日期，不代表论文的发表时间）