Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387..591j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 10, 1992, p. 591-611. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
24
H Ii Regions, Infrared Astronomy, Interstellar Gas, Molecular Clouds, Nebulae, Radio Astronomy, Astronomical Maps, Continuous Radiation, Infrared Astronomy Satellite, Milky Way Galaxy, Point Sources, Ubv Spectra
Scientific paper
Results are presented of observations and analysis of the Sh 187 gas complex in the optical (B, V, R photometry and H-alpha Fabry-Perot interferometry), radio (continuum and H I line at 21 cm, (C-13)O), and the IR (IRAS coadd maps). A kinematical age of about 200,000 yr was derived for the H II region. There is little resemblance between the 1.4-GHz radio continuum and optical emission, indicating that SH 187 is still enshrouded in the parental cloud. The nebula is almost circular with a peak density of 100/cu cm and a total mass of ionozed gas of 7 solar masses. The H II region is partially surrounded by an inhomogeneous H I feature with a NW to the SE velocity gradient. The characteristics of the H I feature are concordant with the predicted values of the model of H I dissociation zones developed by Roger and Dewdney (1991).
Durand Daniel
Joncas Gilles
Roger Robert S.
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