Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.299..323r&link_type=abstract
Nature, vol. 299, Sept. 23, 1982, p. 323-325.
Astronomy and Astrophysics
Astronomy
40
Hydrogen, Planetary Nebulae, Radio Astronomy, Absorption Spectra, Centimeter Waves, Very Large Array (Vla)
Scientific paper
Results of observations of the 21-cm line of neutral hydrogen in absorption are employed to model the physical mechanisms of the thermal radio source NGC6302. The Very Large Array detected velocity components of 6 and 40km/sec, with the former being attributed to a line-of-sight cloud. The 40 km/sec component was concluded to be connected with NGC6302 due to its distance of more than 5 kpc from the sun, and because the absorption feature is shifted 9 km/sec to the blue, which indicated H I gas expanding away from the nebula, a feature common to planetary nebulae in particular. H I absorption is noted to be detectable only during a thousand year transition of an envelope from neutral to full ionization. A toroidal gaseous structure is modeled as being around the star and expanding at 10 km/sec. A neutral outer part produces the H I absorption feature, which has a 300 K temperature and a mass of 0.06 solar mass, neglecting molecular hydrogen.
Moran James Michael
Rodriguez Luis F.
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