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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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2010 National Astronomical Observatories of Chinese Academy of Sciences and IOP Publishing Ltd.
, , Citation Bo Wang and Zhan-Wen Han 2010 Res. Astron. Astrophys. 10 681 DOI 10.1088/1674-4527/10/7/007

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Author affiliations

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

Dates

  1. Received 25 January 2010
  2. Accepted 23 April 2010
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Abstract

HD 49798 is a hydrogen depleted subdwarf O6 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.

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10.1088/1674-4527/10/7/007