The IRAS low-resolution spectra of planetary nebulae

Journal Article · Wed Aug 01 04:00:00 EDT 1990 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115531· OSTI ID:6439926

Volk, K; Cohen, M ^[1]

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1. SETI Institute, Mountain View, CA (USA) California Univ., Berkeley (USA)

This paper presents the low-resolution spectra of 170 planetary nebulae observed by IRAS, most of which were not included in the Atlas of Low-Resolution Spectra. These have been classified into eight groups based upon the spectral morphology, with emphasis on the dust continuum rather than the spectral lines. The Low-Resolution Spectrometer (LRS) spectra are nearly evenly divided between spectra which show only a dust continuum with no lines, and spectra where there are strong lines with a dust continuum appearing longwards of about 15 microns. A study has been made of the strength of the 11.3-micron PAH emission feature as a function of the nebular C/O ratio, combining ground-based and LRS data. The C/O ratio for IC 2621 is derived from IUE spectra and used in this study. The 11.3-micron feature is present with essentially constant strength in all nebulae with C/O above about 1. Only marginal evidence exists for its presence below C/O about 1 and then at a level about 5 times lower than in carbon-rich nebulae. 48 refs.

• OSTI ID: 6439926
• Journal Information: Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 100; ISSN 0004-6256; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AROMATICS
CARBON
CATALOGS
CHEMICAL COMPOSITION
CLASSIFICATION
COSMIC DUST
DOCUMENT TYPES
DUSTS
ELEMENTS
HYDROCARBONS
INFRARED SPECTRA
MORPHOLOGY
NEBULAE
NONMETALS
ORGANIC COMPOUNDS
OXYGEN
PLANETARY NEBULAE
POLYCYCLIC AROMATIC HYDROCARBONS
SPECTRA
STAR EVOLUTION
STELLAR ACTIVITY
STELLAR WINDS
SURVEYS