Fluorescent H2 Emission in the Planetary Nebulae BD+30 3639 and HB 12

  • H. L. Dinerstein
  • J. S. Carr
  • P. M. Harvey
  • D. F. Lester
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 131)

Abstract

We report results from a program of near-infrared spectroscopic observations of the H2 emission from planetary nebulae, being carried out at McDonald Observatory using an InSb array-detector spectrometer. Our observations employ both high spatial resolution (3″ diameter aperture) and high spectral resolution (λ/Δλ = 200–600), thus avoiding potential problems with line blending and spatial registration. These observations provide simultaneous measurements of H I recombination lines and H2 emission lines, thus accurately defining the relative extent and distribution of the ionized vs. molecular material. One-dimensional cuts through the compact planetary nebulae BD+30 3639 and Hubble 12, taken along east-west and north-south axes through the nebular centers, show that the H2 emission is concentrated in a ring or shell outside the ionized nebular core. The angular extent of the H2 emission in Hb 12, with a characteristic diameter of about 8–10″ arc seconds, is strikingly larger than the dimensions of the ionized core, which is less than 2″ in diameter.

Keywords

High Spectral Resolution Planetary Nebula Recombination Line Diameter Aperture Characteristic Diameter 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© International Astronomical Union 1989

Authors and Affiliations

  • H. L. Dinerstein
    • 1
  • J. S. Carr
    • 1
  • P. M. Harvey
    • 1
  • D. F. Lester
    • 1
  1. 1.Astronomy Department and McDonald ObservatoryUniversity of Texas at AustinUSA

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