Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5603k&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #56.03; Bulletin of the American Astronomical Society, Vol. 24, p.1213
Astronomy and Astrophysics
Astronomy
Scientific paper
A number of recently-identified proto-planetary nebulae (PPN) have been observed with near-infrared (J,H,K) and mid-infrared (10 and 20 micron) spectroscopy. In the H band, most of the objects show hydgrogen Brackett lines in absorption. In the K band, absorption bands (from v=2-0 to v=8-6) of CO have been detected, and in a few cases CO emission was detected. Several objects show unusual 3.4 micron emission in the L band. This 3.4 micron feature has usually been observed in hotter objects and it is detected for the first time in objects of such late spectral types (F-G). At 20 micron, four new objects have been found to show the 21 micron unidentified emission feature. All the nine of the 21 micron sources known to date are carbon-rich, suggesting that carbon may be a major constituent of the molecule/grain responsible for the feature.
Geballe Thomas Ronald
Hrivnak Bruce J.
Kwok Sun
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