An infrared study of the giant H II region NGC 3603

Details An infrared study of the giant H II region NGC 3603 An infrared study of the giant H II region NGC 3603

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..275p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 2, March 1985, p. 275-281. Research supported by the Science and Engi

Astronomy and Astrophysics

Astrophysics

14

H Ii Regions, Infrared Stars, Stellar Evolution, Stellar Spectrophotometry, Stellar Winds, Hot Stars, Infrared Spectra, M Stars, Spectral Energy Distribution, Supergiant Stars, Variable Stars, Wolf-Rayet Stars

Scientific paper

New infrared observations of several sources in the complex giant H II region NGC 3603 are presented. Three sources, Irs1, Irs2, and Irs9, embedded in the optically visible nebula, have been analyzed in detail by means of CVF spectra between 2 and 4 microns and a 2.2-micron map. The presence of the hydrogen Br-alpha and Br-gamma emission lines in the spectrum of Irs1 with an intensity ratio of 0.65 suggests a stellar wind being associated with this object. The near-infrared energy distribution of Irs9 can be fitted by a black body at 900 K; its spectrum is featureless in the 2 micron region while the 3.3 micron emission feature can be traced in the 3-4 micron window. HD 97950, responsible for the ionization of the giant H II-region, is shown to have an excess emission longward of about 2 microns, which, if interpreted as originating in an ionized stellar wind, implies a mass-loss rate of 0.000025 solar masses/yr, typical for a Wolf-Rayet star. Finally, the source Irs16, located NE of the bright nebula, was classified from the strong CO and H2O absorption bands as late M; it shows a long term variability in the K-band of about 6 mag.

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