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

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

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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.

作者 Bo Wang Zhan-Wen Han

机构地区 National Astronomical Observatories / Yunnan Observatory Key Laboratory for the Structure and Evolution of Celestial Objects Graduate University of Chinese Academy of Sciences

出处《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 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)

关键词 binaries close -- stars individual （HD 49798） -- stars evolution -- supernovae general -- white dwarfs 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 [电子电信—电路与系统]

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Research in Astronomy and Astrophysics

2010年第7期

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

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