Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....60..233i&link_type=abstract
Astronomy and Astrophysics, vol. 60, no. 2, Sept. 1977, p. 233-249.
Astronomy and Astrophysics
Astronomy
44
Astronomical Maps, Galactic Structure, H Ii Regions, Hydrogen Ions, Interstellar Gas, Radio Sources (Astronomy), Stellar Evolution, Flux Density, Infrared Radiation, Microwaves, Radial Velocity, Tables (Data)
Scientific paper
Detailed radio maps of eight Galactic H II regions at wavelengths of 6 and 21 cm are presented. The observed regions include S 90, S 104, DR 15, S 125, S 142, S 143, S 184, and S 228. Available radial-velocity data are provided along with equatorial and galactic coordinates, optical sizes, kinematical distances, exciting-star identifications and parameters, distances derived from the stellar distance moduli, flux densities, linear diameters, rms electron densities, emission measures, and excitation parameters. The results obtained for each region indicate that: (1) S 90, S 142, and S 184 are evolved beyond the compact stage; (2) S 104 is a rather old but normal H II region with point sources nearby that may be compact H II regions; (3) DR 15 may be a cluster of OB stars in an early stage of development; and (4) star formation is still occurring in the vicinity of S 228, but probably on a modest scale.
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