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Pinwheel Nebula around WR 98a.

Monnier, Tuthill, Danchi

    The Astrophysical Journal
    |October 20, 1999
    PubMed
    Summary
    This summary is machine-generated.

    We captured the first near-infrared images of the dusty Wolf-Rayet star WR 98a, revealing a "pinwheel" nebula. This discovery provides insights into massive binary star evolution and dust formation.

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    Area of Science:

    • Astronomy
    • Astrophysics
    • Stellar Evolution

    Background:

    • Wolf-Rayet stars are massive, evolved stars crucial for understanding stellar lifecycles.
    • Dust formation around massive stars is a key process in galactic chemical evolution.
    • Previous observations identified a unique dust shell around WR 104, suggesting a new class of stellar objects.

    Purpose of the Study:

    • To obtain the first near-infrared images of the dusty Wolf-Rayet star WR 98a.
    • To resolve the dust shell structure and analyze its morphology.
    • To investigate the binary parameters and dust outflow of WR 98a using an interacting winds model.

    Main Methods:

    • Utilized aperture-masking interferometry with the Keck I telescope.
    • Conducted multi-epoch observations at 2.2 µm over approximately one year.

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  • Applied an interacting winds model to interpret collimated dust outflow.

    • Main Results:

    • Resolved the dust shell of WR 98a into a
    • pinwheel
    • nebula, the second observed example of this type.
    • Derived binary orbital parameters: a period of 565±50 days and a viewing angle of 35°±6°.
    • Estimated a wind speed of 99±23 mas yr⁻¹, consistent with photometric variations.

    Conclusions:

    • WR 98a and WR 104 represent a class of massive, short-period binaries.
    • Their orbits likely circularized during a red supergiant phase.
    • The current separation suggests Roche lobe overflow terminated the supergiant phase, leading to the Wolf-Rayet stage.