Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..116r&link_type=abstract
The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb
Physics
1
Scientific paper
In order to study the detailed distribution of element abundances in the galaxy, infrared spectra from 2.5 to 196 microns were taken towards a sample of 46 Compact and Ultra Compact HII regions using the two spectrographs (LWS and SWS) on board ISO. The sample spans a large range in galactocentric distance (0 to 25 kpc). The SWS-LWS spectra display significant variations from source to source in both spectral shape and content. The fine structure lines of O, N, Ne, Ar, S, C and Si are detected in most sources with some species (O, N, Ne, Ar) present in different stages of ionisation. The properties of the ionised gas such as the degree of ionisation or the temperature can thus be precisely constrained leading to accurate determinations of the element abundances. Results on the variation of various abundance indicators with galactocentric radius confirm that abundances decrease with increasing radius as reported in previous studies. The data suggest a flattening of the abundance gradients towards the galactic centre.
Baluteau Jean-Paul
Cox Pierre
Peeters Els
Roelfsema Peter R.
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