Proto-Planetary Nebulae and IRAS "25 Micron Peakers"

Details Proto-Planetary Nebulae and IRAS "25 Micron Peakers" Proto-Planetary Nebulae and IRAS "25 Micron Peakers"

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stin...0020034h&link_type=abstract

Technical Report, Valparaiso Univ. IN United States

Astronomy and Astrophysics

Astronomy

Planetary Nebulae, Infrared Astronomy Satellite, Dust, Stellar Envelopes, Data Bases, Energy Distribution, Spectral Energy Distribution, Photosphere

Scientific paper

In this program, we used the IRAS database to identify and study proto-planetary nebulae (PPNs), objects in transition from the asymptotic giant branch (AGB) to the planetary nebula (PN) phase. Such objects radiate predominately in the mid-infrared 10-30 micrometer region, due to emission from warm (150-300 K) circumstellar dust. We used the IRAS database to identify 55 objects whose fluxes peak in the IRAS 25 micrometer band and which are associated with visible stars. We combined IRAS and supporting ground-based data to delineate their spectral energy distributions. For PPN, we find that they have a double-peaked spectral energy distribution, with one peak in the visible from the reddened photosphere and the second in the mid-infrared from the re-emission by the warm dust. This study has led to a number of new results in our understanding of these transitional objects.

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