Computer Science
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9220463k&link_type=abstract
Unknown
Computer Science
Emission Spectra, Galactic Nuclei, Helium, Infrared Spectra, Line Spectra, Milky Way Galaxy, Galactic Clusters, Infrared Spectroscopy, Nebulae, Star Formation, Stellar Mass, Velocity Distribution
Scientific paper
Resolution imaging spectroscopy data of HeI n=21P yields n=21S 2.06 micrometer line emission in the central 45 inches of the Galactic Center is reported. The data gave new information on the energy production in the central parsec. Relatively narrow emission from nebular knots on the SgrA West ionized gas streamers, and a group of about a dozen compact, broad line HeI sources were found. Compact, broad line HeI sources are concluded to represent a cluster of late type, blue supergiants or Wolf-Rayet stars with heavy mass loss. The HeI emission comes from the extended atmospheres of these stars that have mass loss rates of a few 0.00001 to 0.0001 solar mass per year and outflow velocities of about 1000 km/s. The total mass outflow rate created by the central cluster is about 0.0003 solar mass per year. The high ratio of HeI/HI (Br(alpha), Br(gamma)) fluxes suggests an overabundance of helium in the atmospheres of these stars. The HeI stars are members of a cluster of massive stars that can account for the total luminosity, the flux of Lyman continuum photons, and the fairly low excitation of the central few parsecs. The data shows very clearly that massive star formation has taken place in the Galactic Center within the last few million years.
Drapatz Siegfried
Genzel Reinhard
Krabbe Alfred
Rotaciuc Valentin
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