Evidence for a binary origin of the young planetary nebula hubble 12

Chih Hao Hsia, Wing Huen Ip, Jin Zeng Li

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Young planetary nebulae play an important role in stellar evolution when intermediate- to low-mass stars (0.8-8 M) evolve from the proto-planetary nebula phase to the planetary nebula phase. Many young planetary nebulae display distinct bipolar structures as they evolve away from the proto-planetary nebula phase. One possible cause of their bipolarity could be a binary origin for their energy source. Here we report on our detailed investigation of the young planetary nebula Hubble 12, which is well known for its extended hourglass-like envelope. We present evidence with time-series photometric observations for the existence of an eclipsing binary at the center of Hubble 12. In addition, low-resolution spectra of the central source show absorption features such as CN, G band, and Mg b, which can be suggestive of a low-mass nature for the secondary component.

Original languageEnglish
Pages (from-to)3040-3046
Number of pages7
JournalAstronomical Journal
Issue number6
StatePublished - Jun 2006


  • Binaries: general
  • Planetary nebulae: individual (Hubble 12)


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