Engineering topics
Publications and source records attributed to Hyland, A. R..
Medium resolution spectra in the two-micron region have been obtained for a representative sample of carbon variables. Observed variations in band strengths as function of color, carbon abundance, and variability type are interpreted as being due to thermal emission from a circumstellar dust shell.
The IR point source in the Orion Nebula commonly known as Becklin's star appears to be exceptional because of its extreme colors and the lack of any associated optical object. Characteristics of the spectrum of Becklin's object are examined. It is found that the spectrum is consistent with that of a highly reddened early-type supergiant, in which weak absorption has been masked by low resolution.
IR radiation sources, discussing intermediate and early stars, galactic nucleus and extragalactic sources
Herculis 89 supergiant abnormal IR radiation flux originating in circumstellar shell of solid particles radiating at observed long wavelengths
Photometric IR observations of Nova Serpentis 1970, showing visual flux decrease
Unusual IR object IRC plus 10216 interpreted as galactic source surrounded by optically thick dust shells, noting resemblance to black body energy distribution
IR colors and optical and IR spectra of irregular M variable star and bright OH source VY CMa indicating supergiant classification