scientific abstract: emission features are often observed in the near and mid-infrared spectra of planetary(pne) and protoplanetary nebulae(ppne). these include nebular emission from recombination and collisionally excited lines, emission lines due to ne, ar and s, and unidentified infrared (uir) emission features attributed to polycyclic aromatic hydrocarbons (pahs). the present proposal, that is the first part of a general proposal of pne and ppne, consists in studying the differences in spatial distribution of these emission features, for a selected number of pne and ppne. observation summary: the differences in spatial distribution of atomic lines, thermal dust, and small grains (pahs), will be obtained with cam observations in cvf mode (cam04). for the brightest pne and ppne (crl2688,ngc7027,hd44179,bd303639), spectral images will be taken with a p.f.o.v of 1.5 arcsec at 85 cvf positions between 5 and 16.5 micron and 13 cvf positions between 3.6 and 4.3 micron. to avoid saturation, an integration time per point of 0.28 sec will be used for the lw spectra, and 6 sec for the sw. the sources ic418,ngc6302,ngc6543, and vy2-2 will be observed with the same p.f.o.v., but with an integration time per point of 2 sec in lw, and only 6 cvf positions between 3.9 and 4.2 micron. finally, for the pne ngc2346 and ngc6720,proposed to be observed in priority 3, only 15 spectral positions in cvf lw centered at 6.2 micron (5.9-6.3;4 points), 7.7 micron (7.4-8.1;7 points), and 11.3(10.9-11.6;4 points) are required with a p.f.o.v of 3 arcsec and tin= 10 sec/point. in addition, spectral images at 3 cvf positions around 4.04 micron (br-alfa line) will be obtained for these pne using tin= 20 sec /point. the expected s/n is greater than 40 for the lw spectra, and 10-20 for the sw cvf observations.
Instrument
CAM01 , CAM04
Temporal Coverage
1996-04-27T23:47:56Z/1997-05-16T04:36:27Z
Version
1.0
Mission Description
The Infrared Space Observatory (ISO) was the worlds first true orbiting infrared observatory. Equipped with four highly-sophisticated and versatile scientific instruments, it was launched by Ariane in November 1995 and provided astronomers world-wide with a facility of unprecedented sensitivity and capabilities for a detailed exploration of the Universe at infrared wavelengths.
European Space Agency, Persi et al., 1999, 'Infrared Structure of selected Planetary and Proto-Planetary Nebulae: I.Spectrophotometric Imaging', 1.0, European Space Agency, https://doi.org/10.5270/esa-98kk67j
Rights
Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license.
