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Science 16 October 1998:
Vol. 282. no. 5388, p. 377
DOI: 10.1126/science.282.5388.377c
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This Week in Science

Figure 1

Stellar birth is assumed to proceed in clouds of unstable dust and gas that collapse into massive, very dense condensations. Cernicharo et al. (p. 462) used radio and optical ground-based telescopes and the infrared space observatory (ISO) to obtain detailed observations of the very young galactic Trifid nebula (age less than 100,000 years). The Trifid nebula is an HII region that consists of an ionized shell of H+, other ionized elements, and dust around a young, central star. The authors observed one bright condensation and four point-like sources in the nebula, which they interpret as stars in the act of formation. These protostars were formed in the ionizing bubble of gas and dust of the central star, and once they are fully developed, they will probably trigger further star formation.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)