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    THE NUCLEUS OF THE PLANETARY NEBULA EGB 6 AS A POST-MIRA BINARY

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    Bond_ApJ_2016.pdf (6.142Mb)
    Issue Date
    2016-07-27
    Author
    Bond, Howard
    Robin, Ciardullo
    Esplin, Taran L.
    Hawley, Steven A.
    Liebert, James
    Munari, Ulisse
    Publisher
    American Astronomical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Rights
    © 2016. The American Astronomical Society. All rights reserved.
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    Abstract
    EGB 6 is a faint, large, ancient planetary nebula (PN). Its central star, a hot DAOZ white dwarf (WD), is a prototype of a rare class of PN nuclei associated with dense, compact emission-line knots. The central star also shows excess fluxes in both the near-infrared (NIR) and mid-infrared (MIR). In a 2013 paper, we used Hubble Space Telescope (HST) images to show that the compact nebula is a point-like source, located 0 16 (∼118 AU) from the WD. We attributed the NIR excess to an M dwarf companion star, which appeared to coincide with the dense emission knot. We now present new ground-based NIR spectroscopy, showing that the companion is actually a much cooler source with a continuous spectrum, apparently a dust-enshrouded low-luminosity star. New HST images confirm common proper motion of the emission knot and red source with the WD. The I-band, NIR, and MIR fluxes are variable, possibly on timescales as short as days. We can fit the spectral energy distribution (SED) with four blackbodies (the WD, a ∼1850 K NIR component, and MIR dust at 385 and 175 K). Alternatively, we show that the NIR/MIR SED is very similar to that of Class 0/I young stellar objects. We suggest a scenario in which the EGB 6 nucleus is descended from a wide binary similar to the Mira system, in which a portion of the wind from an AGB star was captured into an accretion disk around a companion star; a remnant of this disk has survived to the present time and is surrounded by gas photoionized by UV radiation from the WD.
    URI
    http://hdl.handle.net/1808/25273
    DOI
    https://doi.org/10.3847/0004-637X/826/2/139
    Collections
    • Physics & Astronomy Scholarly Works [1711]
    Citation
    Bond, H. E., Ciardullo, R., Esplin, T. L., Hawley, S. A., Liebert, J., & Munari, U. (2016). The Nucleus Of The Planetary Nebula Egb 6 As A Post-Mira Binary. The Astrophysical Journal, 826(2), 139. doi:10.3847/0004-637x/826/2/139

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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