Abstract
A brief review is made of how IRAS has advanced our understanding of star formation. The IRAS survey has revealed the presence of embedded infrared sources within small, dense cores of molecular gas. Some of these objects may be protostars of roughly solar mass deriving a substantial fraction of their energy from infalling material. Circumstellar disks appear to surround many young stars, both in the embedded phase and, later, as T Tauri stars. IRAS also cataloged regions of high mass star formation across the galaxy. These data may lead to an understanding of what triggers the formation of such stars. Finally, while high mass star formation obviously contributes strongly to the infrared emission from galaxies, observations within the Galaxy show that a substantial fraction of infrared emission comes from dust heated by the ambient radiation field and not directly by young stars.
“[In] the survey…one source…was found which could not be identified… We feel that the object is in the nebula and has a gravitationally associated cool shell…It is well known that the Orion Nebula is a very young association and that the probability of finding a star in the process of forming should be relatively high. Thus an attractive interpretation of the observations is that the infrared object is a protostar.”
E. E. Becklin and G. Neugebauer (1967)
“The discovery of the infrared nebula in Orion means that the early stages of star and star cluster formation can be observed in the far infrared…fundamental problems concerning the earliest stages of stellar evolution can now be answered by direct observation.”
D. E. Kleinmann and F. J. Low (1967)
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6. References
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Beichman, C.A. (1988). The study of star formation with IRAS. In: Lawrence, A. (eds) Comets to Cosmology. Lecture Notes in Physics, vol 297. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0118802
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