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Gas jets associated with star formation.

W J Welch, S N Vogel, R L Plambeck

    Science (New York, N.Y.)
    |June 21, 1985
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    Young stellar objects eject powerful, focused jets and winds, influencing surrounding gas and causing chemical changes. This outflow phase is common for stars and may signal the end of accretion.

    Area of Science:

    • Astrophysics
    • Stellar Evolution
    • Astrochemistry

    Background:

    • Young stellar objects (YSOs) produce energetic, collimated outflows (jets/winds).
    • These outflows interact with surrounding interstellar gas and dust.
    • Observational signatures include molecular emission (e.g., carbon monoxide) and masers.

    Purpose of the Study:

    • To investigate the physical and chemical processes occurring in the vicinity of young stellar objects.
    • To understand the role of outflows in stellar evolution and the interstellar medium.
    • To analyze the chemical abundance changes associated with shock fronts.

    Main Methods:

    • Observational astronomy utilizing molecular line observations (e.g., carbon monoxide).
    • Detection of water maser emission.

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  • Identification and analysis of Herbig-Haro objects.

    • Main Results:

    • Observed turbulent swept-up gas near YSOs.
    • Detected water maser emission and Herbig-Haro objects participating in outflows.
    • Documented significant chemical abundance variations linked to shock phenomena.

    Conclusions:

    • Stellar outflows are a common phenomenon across a range of YSO luminosities.
    • These outflows significantly impact the chemistry of the surrounding interstellar medium.
    • The outflow phase likely represents a critical stage in late-stage stellar accretion.