Infrared objects near H2O masers in regions of active star formation. III - Evolutionary phases deduced from IR recombination line and other data

Details Infrared objects near H2O masers in regions of active star formation. III - Evolutionary phases deduced from IR recombination line and other data Infrared objects near H2O masers in regions of active star formation. III - Evolutionary phases deduced from IR recombination line and other data

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..342m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 342-354.

Astronomy and Astrophysics

Astronomy

32

Astronomical Spectroscopy, Infrared Astronomy, Star Formation, Water Masers, Continuous Spectra, Energy Distribution, H Ii Regions, Interstellar Extinction, Line Spectra, Recombination Reactions

Scientific paper

Spectroscopic observations in the Br-alpha, Br-gamma, and Pf-gamma hydrogen-recombination lines of 11 compact objects near H2O masers, obtained during 1981 and 1982 using an InSb detector equipped with continuously variable filters on the 3.6-m telescope at ESO, are reported and analyzed. The derived correction factors are explained, and the continuum and recombination-line data are presented in tables and graphs and interpreted for each object. The objects G309.9+0.5, G328.3+0.43, G351.41+0.64, and G5.9-0.4 are found to be ultracompact H II regions (r at 10 microns less than or equal to 8 x 10 to the 16th cm), whereas G324.2+00.12 is a compact H II region, and the nature of the other objects remains unclear. A log-log plot IR luminosity versus (ne squared) (V) for a 25-object sample drawn from these data and from published data on other compact objects near H20 masers suggests that all of them are OB stars with incompletely developed ionization-bounded H II regions. A rough proportionality between H2O and integrated IR fluxes is demonstrated, and the evolutionary relationships implied are discussed.

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