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Molecular diffuse interstellar band carriers in the red rectangle.

P J Sarre, J R Miles, S M Scarrott

    Science (New York, N.Y.)
    |August 4, 1995
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers identified the molecular carriers of unidentified emission bands in the Red Rectangle nebula. These molecules also produce diffuse interstellar absorption bands, indicating they exist in gas-phase molecular form.

    Area of Science:

    • Astrophysics
    • Spectroscopy
    • Astrochemistry

    Background:

    • The Red Rectangle is a unique biconical nebula with unidentified emission bands.
    • Diffuse interstellar bands (DIBs) are observed in interstellar space but their carriers remain largely unknown.

    Purpose of the Study:

    • To investigate the nature of unidentified emission bands in the Red Rectangle nebula.
    • To determine if these emission bands share carriers with known diffuse interstellar absorption bands.

    Main Methods:

    • High-resolution optical spectroscopy of the Red Rectangle nebula.
    • Analysis of emission band wavelengths and widths as a function of distance from the central star HD 44179.
    • Comparison of Red Rectangle band properties with known diffuse interstellar absorption bands.

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    Main Results:

    • Observed emission bands in the Red Rectangle show decreasing peak wavelengths and widths with increasing distance from the central star.
    • These bands converge to values matching known diffuse interstellar absorption bands (e.g., 5797, 5850, 6614 angstroms).
    • The same molecular species are responsible for both the Red Rectangle emission bands and specific diffuse interstellar absorption bands.

    Conclusions:

    • The carriers of these unidentified Red Rectangle emission bands are gas-phase molecules.
    • These molecules are also responsible for certain diffuse interstellar absorption bands, linking nebular emission to interstellar chemistry.