A likely candidate of type Ia supernova progenitors: the X-ray pulsating companion of the hot subdwarf HD 49798  

作　　者：Bo Wang Zhan-Wen Han 

机构地区：[1]National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences Kunming 650011, China [2]Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011, China [3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Research in Astronomy and Astrophysics》2010年第7期681-688,共8页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 10821061);the National Basic Research Program of China (Grant No. 2007CB815406);the Chinese Academy of Sciences (Grant No. KJCX2-YW-T24)

摘　　要：HD 49798 is a hydrogen depleted subdwarf 06 star and has an X-ray pulsating companion （RX J0648.0-4418）. The X-ray pulsating companion is a massive white dwarf. Employing Eggleton＇s stellar evolution code with the optically thick wind assumption, we find that the hot subdwarf HD 49798 and its X-ray pulsating companion could produce a type Ia supernova （SN Ia） in future evolution. This implies that the binary system is a likely candidate of an SN Ia progenitor. We also discuss the possibilities of some other WD ＋ He star systems （e.g. V445 Pup and KPD 1930＋2752） for producing SNe Ia.HD 49798 is a hydrogen depleted subdwarf 06 star and has an X-ray pulsating companion （RX J0648.0-4418）. The X-ray pulsating companion is a massive white dwarf. Employing Eggleton＇s stellar evolution code with the optically thick wind assumption, we find that the hot subdwarf HD 49798 and its X-ray pulsating companion could produce a type Ia supernova （SN Ia） in future evolution. This implies that the binary system is a likely candidate of an SN Ia progenitor. We also discuss the possibilities of some other WD ＋ He star systems （e.g. V445 Pup and KPD 1930＋2752） for producing SNe Ia.

关 键 词：binaries close -- stars individual （HD 49798） -- stars evolution -- supernovae general -- white dwarfs 

分 类 号：P145.3[天文地球—天体物理] TN78[天文地球—天文学]