An X-ray and optical light curve model of the eclipsing symbiotic binary SMC3

Mariko Kato, Izumi Hachisu, Joanna Mikołajewska

研究成果: Article査読

8 被引用数 (Scopus)


Some binary evolution scenarios for Type Ia supernovae (SNe Ia) include long-period binaries that evolve to symbiotic supersoft X-ray sources in their late stage of evolution. However, symbiotic stars with steady hydrogen burning on the white dwarf's (WD) surface are very rare, and the X-ray characteristics are not well known. SMC3 is one such rare example and a key object for understanding the evolution of symbiotic stars to SNe Ia. SMC3 is an eclipsing symbiotic binary, consisting of a massive WD and red giant (RG), with an orbital period of 4.5 years in the Small Magellanic Cloud. The long-term V light curve variations are reproduced as orbital variations in the irradiated RG, whose atmosphere fills its Roche lobe, thus supporting the idea that the RG supplies matter to the WD at rates high enough to maintain steady hydrogen burning on the WD. We also present an eclipse model in which an X-ray-emitting region around the WD is almost totally occulted by the RG swelling over the Roche lobe on the trailing side, although it is always partly obscured by a long spiral tail of neutral hydrogen surrounding the binary in the orbital plane.

ジャーナルAstrophysical Journal
出版ステータスPublished - 2013 1月 20

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


「An X-ray and optical light curve model of the eclipsing symbiotic binary SMC3」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。