Engineering topics

Tokunaga, Alan T.

Publications and source records attributed to Tokunaga, Alan T..

20 records · Page 2

NASA NTRS1988

Search for volatiles on icy satellites. I - Europa

NASA IRTF reflectance spectra of unprecedented precision, obtained for the leading and trailing sides of Europa, are presently noted to no longer show the apparent absorptions seen in 1980 and 1985. It is presently suggested that if the weak absorptions seen in the 1980 and 1985 data are real, they may indicate the transient spectroscopic presence of a molecular component on Europa's trailing side that differs from the water ice known to be the dominant constituent of the surface.

Brown, Robert Hamilton↗

NASA NTRS1988

High-resolution spectroscopy of the 3 micron emission features in NGC 7027 and IRAS 21282+5050

High-resolution 3 micron spectra of NGC 7027 and IRAS 21282+5050 are presented. The well-known 3.29 micron emission feature has very similar shapes in the two objects, but a small shift is present between them. The emission features at 3.46 and 3.52 microns recently found in IRAS 21282+5050 are also present in the spectrum of NGC 7027. In addition, there may be two other weak features at 3.55 and 3.58 microns in NGC 7027. These emission features might be related to saturated hydrocarbons. The spectra provide further constraints on the origin of the 'unidentified' emission features.

Nagata, Tetsuya↗