Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1207t&link_type=abstract
Astronomical Journal, vol. 87, Aug. 1982, p. 1207-1212. Research supported by the University of Arizona and University of Wyomi
Astronomy and Astrophysics
Astronomy
23
Infrared Spectroscopy, Late Stars, Near Infrared Radiation, Planetary Nebulae, Stellar Evolution, Carbon Monoxide, Continuums, Emission Spectra, H Ii Regions, Hydrogen, Ionized Gases, Radio Emission
Scientific paper
Moderate-resolution near-infrared spectroscopy is presented for two possible protoplanetary nebulae: the Red Rectangle (AFGL 915; HD 44179) and the Cygnus Egg (AFGL 2688). The Rectangle shows a generally featureless but very red continuum. There may be very weak CO absorption at 2.3 microns, which would suggest the presence of a late-type stellar component. The spectrum of the Egg is dominated by H2 rotation-vibration emission characteristic of shock excitation. Apparently without an expanding H II region and no early-type exciting star, the source of this shock is probably mass loss from a rapidly evolving central star.
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