SIMBAD references

1997A&A...325..700N - Astronomy and Astrophysics, volume 325, 700-708 (1997/9-2)

Quantitative spectroscopy of the HeI cluster in the Galactic Center.

NAJARRO F., KRABBE A., GENZEL R., LUTZ D., KUDRITZKI R.P. and HILLIER D.J.

Abstract (from CDS):

We present first results on quantitative infrared spectroscopy of the brightest HeI emission line stars in the Galactic center. The observed HeI and H broad emission lines are caused by extremely strong stellar winds ({dot}(M)∼5 to 80x10–5M/yr) with relatively small outflow velocities (V∼300 to 1000km/s). The effective temperatures of the objects range from 17,000K to 30,000K with corresponding stellar luminosities of 1 to 30x105L. Strongly enhanced helium abundances (NHe/NH>.5) are found. These results indicate that the HeI emission line stars are evolved blue supergiants close to the evolutionary stage of Wolf-Rayet stars. They power the central parsec and belong to a young stellar cluster of massive stars which formed a few million years ago.

Abstract Copyright:

Journal keyword(s): stars: early-type - stars: mass-loss - stars: supergiants - stars: emission-line - Galaxy: center - infrared: stars

Nomenclature: GCIRS NNWN No. 13E1

Simbad objects: 21

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