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Evidence for a Binary origin of the Young Planetary Nebula HB 12

Chih Hao Hsia·Wing Huen Ip·Jin Zeng Li
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Abstract

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 nebulae phase to the planetary nebulae phase. Many young planetary nebulae display distinct bipolar structures as they evolve away from the proto-planetary nebulae phase. One possible cause of their bipolarity could be due to a binary origin of its energy source. Here we report 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 the existence of an eclipsing binary at the center of Hubble 12. Low-resolution spectra of the central source show, on the other hand, absorption features such as CN, G-band & Mg b, which can be suggestive of a low-mass nature of the secondary component.

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Chih Hao Hsia, Wing Huen Ip, Jin Zeng Li. 2006-03-08. Evidence for a Binary origin of the Young Planetary Nebula HB 12. https://arxiv.org/abs/nlin/0603006

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