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Related Experiment Videos

Evidence for large organic molecules in the diffuse medium using optical high resolution spectroscopy.

P Sonnentrucker1, B H Foing, P Ehrenfreund

  • 1Observatoire de Strasbourg, France.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|September 7, 2001
PubMed
Summary

Diffuse Interstellar Bands (DIBs) are cosmic absorption lines. Comparing the lambda 6613 angstroms DIB profile with sodium and calcium lines reveals insights into the carriers of these mysterious interstellar features.

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Area of Science:

  • * Astronomy and Astrophysics
  • * Interstellar Medium Studies

Background:

  • * Diffuse Interstellar Bands (DIBs) are absorption features observed in the spectra of reddened OB stars.
  • * Their widespread presence suggests stable and abundant molecular carriers in space.
  • * Substructures in DIB line profiles hint at a gas-phase molecular origin.

Purpose of the Study:

  • * To investigate the nature of DIB carriers by analyzing line profile substructures.
  • * To compare the velocity structure of the lambda 6613 angstroms DIB with known atomic species.
  • * To study 6 targets within the Perseus OB2 association.

Main Methods:

  • * High-resolution spectroscopy was employed to analyze DIB line profiles.
  • * Comparative analysis of the lambda 6613 angstroms DIB profile against NaD1 and CaII profiles.

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  • * Examination of velocity structures in spectral lines.

    • Main Results:

    • * The study compared the velocity structure of the lambda 6613 angstroms DIB with NaD1 and CaII profiles.
    • * Analysis was conducted on 6 specific targets in the Perseus OB2 association.
    • * Observed velocity structures provide clues to the physical conditions and carrier properties.

    Conclusions:

    • * Line profile studies are crucial for understanding the nature of DIB carriers.
    • * Comparing DIBs with atomic lines aids in characterizing their molecular origins.
    • * Further research on DIB velocity structures can illuminate their composition and distribution.