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Discovery of an extraordinarily massive cluster of red supergiants
(University of Chicago Press: Astrophysical Journal, 2006-06-01)
We report the discovery of an extraordinarily massive young cluster of stars in the Galaxy, having an inferred total initial cluster mass comparable to the most massive young clusters in the Galaxy. Using IRMOS, 2MASS, and ...
High spectral resolution observations of the massive stars in the galactic center
(University of Chicago Press: Astrophysical Journal, 2006-04-20)
We present high-resolution near-infrared spectra, obtained with the NIRSPEC spectrograph on the W. M. Keck II Telescope, of a collection of hot, massive stars within the central 25 arcseconds of the Galactic center. We ...
The double-lined spectrum of LBV 1806-20
(University of Chicago Press: Astrophysical Journal Letters, 2004-08-01)
Despite much theoretical and observational progress, there is no known firm upper limit to the masses of stars. Our understanding of the interplay between the immense radiation pressure produced by massive stars in formation ...
High precision stellar radial velocities in the galactic center
(University of Chicago Press: Astrophysical Journal, 2003-12-20)
We present radial velocities for 85 cool stars projected onto the central parsec of the Galaxy. The majority of these velocities have relative errors of 1 kms−1, or a factor of 30-100 smaller than those previously obtained ...
Massive stars in the Arches cluster
(University of Chicago Press: Astrophysical Journal, 2002-12-10)
We present and use new spectra and narrow-band images, along with previously published broad-band images, of stars in the Arches cluster to extract photometry, astrometry, equivalent width, and velocity information. The ...
2 micron spectroscopy within 0.3 arcseconds of SgrA* [Sagittarius A*]
(University of Chicago Press: Astrophysical Journal Letters, 2000-04-10)
We present moderate (R ≈ 2,700) and high resolution (R ≈ 22,000) 2.0−2.4 µm spectroscopy of the central 0.1 square arcseconds of the Galaxy obtained with NIRSPEC, the facility near-infrared spectrometer for the Keck II ...
J-band infrared spectroscopy of a sample of brown dwarfs using NIRSPEC on Keck II
(University of Chicago Press: Astrophysical Journal Letters, 2000-04-10)
Near-infrared spectroscopic observations of a sample of very cool, low-mass objects are presented with higher spectral resolution than in any previous studies. Six of the objects are L-dwarfs, ranging in spectral class ...