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Related Experiment Videos

Mariner 9 ultraviolet spectrometer experiment: stellar observations.

C F Lillie, R C Bohlin, M R Molnar

    Science (New York, N.Y.)
    |January 21, 1972
    PubMed
    Summary
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    Ultraviolet spectra of early-type stars reveal key elemental lines. Mariner 9 data show energy distributions approximately 20% lower than previous observations, impacting stellar astrophysics research.

    Area of Science:

    • Astronomy and Astrophysics
    • Stellar Spectroscopy

    Background:

    • Early-type stars are crucial for understanding stellar evolution and galactic composition.
    • Ultraviolet (UV) spectroscopy provides unique insights into stellar atmospheres and compositions.

    Purpose of the Study:

    • To obtain photoelectric spectra of early-type stars in the 1100-2000 angstrom range.
    • To identify prominent spectral lines and analyze the absolute energy distribution of these stars.

    Main Methods:

    • Utilized the Mariner 9 ultraviolet spectrometer to capture stellar spectra.
    • Focused on the 1100-2000 angstrom wavelength region.

    Main Results:

    • Successfully identified resonance lines of Hydrogen I (H I), Silicon IV (Si IV), and Carbon IV (C IV).

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  • Detected spectral features from Carbon II (C II), Carbon III (C III), Silicon III (Si III), Iron II (Fe II), and Nitrogen IV (N IV).
  • Derived absolute energy distributions that were approximately 20% lower than those obtained by OAO-2 in the 1200-2000 angstrom range.

    • Conclusions:

    • The study provides valuable UV spectral data for early-type stars.
    • Discrepancies in energy distribution compared to previous missions warrant further investigation into observational methods and calibration.