Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382l..19k&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 382, Nov. 20, 1991, p. L19-L22.
Astronomy and Astrophysics
Astrophysics
231
Emission Spectra, Galactic Nuclei, Infrared Spectra, Star Clusters, Helium, Line Spectra, Milky Way Galaxy
Scientific paper
The present study reports 1.9 arcsec/300 km s resolution imaging spectroscopy of He I n = 2 1P - n = 1 1S 2.06-micron line emission in the Galactic center. There is a group of about a dozen compact broad-line 'He I emission-line stars', most of which are positionally coincident with compact 2-micron continuum sources. It is argued that IRS 16 and its 'broad-line region' is a central concentration of this 1-pc diameter He I star cluster. The He I stars may be blue supergiants with heavy mass loss. The high He I/H I (Br-alpha, Br-gamma) ratios suggest an overabundance of helium in their atmospheres indicative of a postmain-sequence phase. Mass-loss rates range between a few 10 exp -5 and 10 exp -4 solar mass/yr, and outflow velocities are between 500 and 1000 km/s. The present data show 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
No associations
LandOfFree
A cluster of He I emission-line stars in the Galactic center does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A cluster of He I emission-line stars in the Galactic center, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A cluster of He I emission-line stars in the Galactic center will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1716968