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Related Experiment Videos

Observational astrochemistry: recent results.

W M Irvine1

  • 1Five College Radio Astronomy Observatory, University of Massachusetts, Amherst 01003, USA.

Advances in Space Research : the Official Journal of the Committee on Space Research (COSPAR)
|January 1, 1989
PubMed
Summary
This summary is machine-generated.

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Astronomers have identified over 80 interstellar molecules, including biogenic elements and metal halides, in star-forming regions and stellar envelopes. Recent studies reveal significant hydrogen isotopic fractionation in cyclic molecules like C3H2.

Area of Science:

  • Astrochemistry
  • Interstellar Medium Composition
  • Molecular Astronomy

Background:

  • Over 80 molecular species are known in interstellar clouds and stellar envelopes.
  • These molecules contain key elements like hydrogen, carbon, nitrogen, oxygen, sulfur, phosphorus, and silicon.
  • Recent detections include metal halides in evolved star envelopes.

Purpose of the Study:

  • To discuss additions to the list of known interstellar molecules.
  • To present recent measurements of hydrogen isotopic fractionation.
  • To analyze chemical reservoirs and compare observed abundances with theoretical models.

Main Methods:

  • Observational astronomy to detect molecular species.
  • Spectroscopic analysis to identify molecular composition.
Keywords:
NASA Discipline ExobiologyNASA Discipline Number 52-10NASA Program ExobiologyNon-NASA Center

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  • Isotopic ratio measurements, specifically for hydrogen.

    • Main Results:

    • New interstellar molecules have been added to the known catalog.
    • Exceptional hydrogen isotopic fractionation (up to 10,000x cosmic D/H) observed in C3H2.
    • Data on chemical reservoirs and comparisons between models and observations are presented.

    Conclusions:

    • The inventory of interstellar molecules continues to expand.
    • Unusual isotopic ratios provide insights into chemical processes in space.
    • Understanding molecular abundances is crucial for modeling interstellar chemistry and evolution.