The prevalence of neutral gas in massive post-main-sequence nebulae

Bibcode
1989LNP...331..100P
DOI
10.1007/BFb0119455
Phillips, J. P.; Mampaso, A.
Referencia bibliográfica

IN: The physics and chemistry of interstellar molecular clouds - mm and sub-mm observations in astrophysics; Proceedings of the Symposium, Zermatt, Switzerland, Sept. 22-25, 1988 (A90-33833 14-90). Berlin and New York, Springer-Verlag, 1989, p. 100-103.

Fecha de publicación:
1989
Número de autores
2
Número de autores del IAC
0
Número de citas
0
Número de citas referidas
0
Descripción
Results are reported from a CO (J = 2-1) survey of nine type I nebulae using the 12-m NRAO antenna at KPNO; the data are presented in tables, graphs, and contour maps and briefly characterized. Three of the nebulae are found to have significant CO emission, with evidence of (1) dissociated molecular envelopes, (2) complete ionization of the gas by the central-star radiation field, and (3) extremely heterogeneous and clumped neutral zones. The quenching of the observed CO temperatures is tentatively attributed to the large H I velocity gradients (in excess of 100 km/sec pc) typical of such sources, and it is inferred that further observations at higher sensitivity could produce many more detections.
Tipo
Sin árbitro
Nebulosas planetarias
Velocidad radial
Radioastronomía

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