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천문우주과학 연구동향

천문우주과학과 관련된 국내외 상위 학술논문 및 특허 정보를 제공해 드립니다.

넓은 지역으로 분리되어 있는 네 개의 항성 시스템의 형성

The formation of a quadruple star system with wide
  • 작성자 : KASI
  • 작성일 : 2015-02-16
  • 조회수 : 2264
  • 저자Jaime E. Pineda, Stella S. R. Offner, at al.,
  • Absract

     

    The initial multiplicity of stellar systems is highly uncertain. A number of mechanisms have been proposed to explain the origin of binary and multiple star systems, including core fragmentation, disk fragmentation and stellar capture. Observations show that protostellar and pre-main-sequence multiplicity is higher than the multiplicity found in field stars, which suggests that dynamical interactions occur early, splitting up multiple systems and modifying the initial stellar separations. Without direct, high-resolution observations of forming systems, however, it is difficult to determine the true initial multiplicity and the dominant binary formation mechanism. Here we report observations of a wide-separation (greater than 1,000 astronomical units) quadruple system composed of a young protostar and three gravitationally bound dense gas condensations. These condensations are the result of fragmentation of dense gas filaments, and each condensation is expected to form a star on a timescale of 40,000 years. We determine that the closest pair will form a bound binary, while the quadruple stellar system itself is bound but unstable on timescales of 500,000 years. These observations suggest that filament fragmentation on length scales of about 5,000 astronomical units offers a viable


  • 게재정보NATURE(2015.02.14)에 게재된 논문임
  • 첨부파일
  • 원 문http://www.nature.com/nature/journal/v518/n7538/full/nature14166.html
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